Driving into the Sunset: Supporting Cognitive Functioning in Older Drivers
Identifieur interne : 000634 ( Pmc/Corpus ); précédent : 000633; suivant : 000635Driving into the Sunset: Supporting Cognitive Functioning in Older Drivers
Auteurs : Mark S. Young ; David BunceSource :
- Journal of Aging Research [ 2090-2204 ] ; 2011.
Abstract
The rise in the aging driver population presents society with a significant challenge—how to maintain safety and mobility on the roads. On the one hand, older drivers pose a higher risk of an at-fault accident on a mile-for-mile basis; on the other hand, independent mobility is a significant marker of quality of life in aging. In this paper, we review the respective literatures on cognitive neuropsychology and ergonomics to suggest a previously unexplored synergy between these two fields. We argue that this conceptual overlap can form the basis for future solutions to what has been called “the older driver problem.” Such solutions could be found in a range of emerging driver assistance technologies offered by vehicle manufacturers, which have the potential to compensate for the specific cognitive decrements associated with aging that are related to driving.
Url:
DOI: 10.4061/2011/918782
PubMed: 21748014
PubMed Central: 3124981
Links to Exploration step
PMC:3124981Le document en format XML
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Driving into the Sunset: Supporting Cognitive Functioning in Older Drivers</title>
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<front><div type="abstract" xml:lang="en"><p>The rise in the aging driver population presents society with a significant challenge—how to maintain safety and mobility on the roads. On the one hand, older drivers pose a higher risk of an at-fault accident on a mile-for-mile basis; on the other hand, independent mobility is a significant marker of quality of life in aging. In this paper, we review the respective literatures on cognitive neuropsychology and ergonomics to suggest a previously unexplored synergy between these two fields. We argue that this conceptual overlap can form the basis for future solutions to what has been called “the older driver problem.” Such solutions could be found in a range of emerging driver assistance technologies offered by vehicle manufacturers, which have the potential to compensate for the specific cognitive decrements associated with aging that are related to driving.</p>
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<front><journal-meta><journal-id journal-id-type="nlm-ta">J Aging Res</journal-id>
<journal-id journal-id-type="publisher-id">JAR</journal-id>
<journal-title-group><journal-title>Journal of Aging Research</journal-title>
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<issn pub-type="ppub">2090-2204</issn>
<issn pub-type="epub">2090-2212</issn>
<publisher><publisher-name>SAGE-Hindawi Access to Research</publisher-name>
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<article-meta><article-id pub-id-type="pmid">21748014</article-id>
<article-id pub-id-type="pmc">3124981</article-id>
<article-id pub-id-type="doi">10.4061/2011/918782</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Review Article</subject>
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<title-group><article-title>Driving into the Sunset: Supporting Cognitive Functioning in Older Drivers</article-title>
</title-group>
<contrib-group><contrib contrib-type="author"><name><surname>Young</surname>
<given-names>Mark S.</given-names>
</name>
<xref ref-type="aff" rid="I1"><sup>1</sup>
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<xref ref-type="corresp" rid="cor1">*</xref>
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<contrib contrib-type="author"><name><surname>Bunce</surname>
<given-names>David</given-names>
</name>
<xref ref-type="aff" rid="I2"><sup>2, 3</sup>
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<xref ref-type="aff" rid="I3"></xref>
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<aff id="I1"><sup>1</sup>
Ergonomics Research Group, School of Engineering and Design, Brunel University, Uxbridge UB8 3PH, UK</aff>
<aff id="I2"><sup>2</sup>
Department of Psychology, Centre for Cognition and Neuroimaging, Brunel University, Uxbridge UB8 3PH, UK</aff>
<aff id="I3"><sup>3</sup>
Centre for Mental Health Research, Australian National University, Canberra, ACT 0200, Australia</aff>
<author-notes><corresp id="cor1">*Mark S. Young: <email>m.young@brunel.ac.uk</email>
</corresp>
<fn fn-type="other"><p>Academic Editor: Lynda Anderson</p>
</fn>
</author-notes>
<pub-date pub-type="collection"><year>2011</year>
</pub-date>
<pub-date pub-type="epub"><day>25</day>
<month>5</month>
<year>2011</year>
</pub-date>
<volume>2011</volume>
<elocation-id>918782</elocation-id>
<history><date date-type="received"><day>14</day>
<month>12</month>
<year>2010</year>
</date>
<date date-type="rev-recd"><day>17</day>
<month>3</month>
<year>2011</year>
</date>
<date date-type="accepted"><day>31</day>
<month>3</month>
<year>2011</year>
</date>
</history>
<permissions><copyright-statement>Copyright © 2011 M. S. Young and D. Bunce.</copyright-statement>
<copyright-year>2011</copyright-year>
<license license-type="open-access"><license-p>This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.</license-p>
</license>
</permissions>
<abstract><p>The rise in the aging driver population presents society with a significant challenge—how to maintain safety and mobility on the roads. On the one hand, older drivers pose a higher risk of an at-fault accident on a mile-for-mile basis; on the other hand, independent mobility is a significant marker of quality of life in aging. In this paper, we review the respective literatures on cognitive neuropsychology and ergonomics to suggest a previously unexplored synergy between these two fields. We argue that this conceptual overlap can form the basis for future solutions to what has been called “the older driver problem.” Such solutions could be found in a range of emerging driver assistance technologies offered by vehicle manufacturers, which have the potential to compensate for the specific cognitive decrements associated with aging that are related to driving.</p>
</abstract>
</article-meta>
</front>
<body><sec sec-type="section" id="sec1"><title>1. Introduction</title>
<p>There is no doubt that our aging population presents society with a number of economic and public health challenges. One of these challenges is transport, more specifically, personal transport. Recent figures released by the UK Automobile Association predict that, in 20 years, 90% of men and 80% of women aged over 70 years will hold a driving licence. Contrast this with the situation today, where three-quarters of men and only 31% of women in that age group drive. In absolute terms, the number of drivers over 70 is set to double in 20 years [<xref ref-type="bibr" rid="B1">1</xref>
] and hit 10 million by 2050. It is also widely agreed that, per vehicle mile travelled, older drivers are at a higher risk of a fatal crash (e.g., [<xref ref-type="bibr" rid="B2">2</xref>
]). These figures raise concerns for road safety—with more older drivers driving more miles, and, for more years [<xref ref-type="bibr" rid="B3">3</xref>
], there could be a profound impact on absolute numbers of road casualties in the future.</p>
<p>But in an enlightened society, road safety is only one half of the older driver “problem,” as Evans [<xref ref-type="bibr" rid="B4">4</xref>
] puts it; we have a responsibility to meet the mobility needs of a growing population of older adults [<xref ref-type="bibr" rid="B5">5</xref>
]. Well-being in older people depends to a large extent on their ability to successfully engage with various practical and recreational activities in daily life [<xref ref-type="bibr" rid="B6">6</xref>
]. In turn, many of these activities are dependent on being able to drive. Driving thus enables older adults to “keep on living” independently and maintain their quality of life [<xref ref-type="bibr" rid="B7">7</xref>
, <xref ref-type="bibr" rid="B8">8</xref>
]. Evans' [<xref ref-type="bibr" rid="B4">4</xref>
] point is that the older driver “problem” is actually a problem for society—not just a case of getting them off the roads. Indeed, many older people actually restrict their driving boundaries to conditions where they feel safe and comfortable [<xref ref-type="bibr" rid="B9">9</xref>
–<xref ref-type="bibr" rid="B11">11</xref>
], further compounding the problem.</p>
<p>A solution is required which not only supports older drivers but also balances their requirements with road safety targets to continue reducing the number of killed and seriously injured on the roads. Adopting a more user-centred approach, such an alternative would be to compensate for the cognitive limitations of older drivers by making “…changes to the driving environment to make driving safer for the older person, both inside the car in terms of design factors, and perhaps advanced driving information systems, but also outside in terms of traffic system design” [<xref ref-type="bibr" rid="B12">12</xref>
, page 5]. Both academic (e.g., [<xref ref-type="bibr" rid="B10">10</xref>
, <xref ref-type="bibr" rid="B13">13</xref>
]) and policy reports (e.g., [<xref ref-type="bibr" rid="B1">1</xref>
, <xref ref-type="bibr" rid="B3">3</xref>
, <xref ref-type="bibr" rid="B7">7</xref>
, <xref ref-type="bibr" rid="B12">12</xref>
] have suggested that such a solution should exploit vehicle design and safety technology innovations inside the car, underpinned by a sound understanding of the older driver's cognitive abilities and information requirements. “There is a very clear need for such research addressing appropriate technology to aid safe car driving behaviour amongst the older driver population” [<xref ref-type="bibr" rid="B10">10</xref>
].</p>
<p>A major objective of this paper is to consider the literature from several perspectives to understand and propose solutions for the older driver “problem.” Research from cognitive neuropsychology and driving ergonomics is examined, and important synergies and parallels between the two fields are identified as a basis for taking this work forward. Specifically, we suggest that a promising basis for future research stems from work into cognitive inconsistency in neuropsychology and interest in driving performance consistency in ergonomics. Firstly, though, we look at road safety statistics to determine the extent of the problem.</p>
</sec>
<sec sec-type="section" id="sec2"><title>2. Older Drivers and Road Accidents</title>
<p>Although there is some debate over the prevalence of older drivers in road accident statistics, it is widely agreed that, when controlling for exposure, drivers over 70 are at increased risk of an at-fault accident—with the data being comparable to those for the under-25 age group (e.g., [<xref ref-type="bibr" rid="B2">2</xref>
, <xref ref-type="bibr" rid="B4">4</xref>
, <xref ref-type="bibr" rid="B9">9</xref>
, <xref ref-type="bibr" rid="B11">11</xref>
, <xref ref-type="bibr" rid="B13">13</xref>
–<xref ref-type="bibr" rid="B15">15</xref>
]). Casualty rates per mile driven increase with age after 70–75 years [<xref ref-type="bibr" rid="B16">16</xref>
], and the risk increases exponentially for drivers in their 80s [<xref ref-type="bibr" rid="B4">4</xref>
, <xref ref-type="bibr" rid="B11">11</xref>
, <xref ref-type="bibr" rid="B14">14</xref>
]. Whilst physical frailty is undoubtedly a factor in these statistics, the evidence for an association between age and crash risk is growing; any remaining doubt is probably more due to the smaller population of older drivers and “self-regulation” of their driving behaviours (cf. [<xref ref-type="bibr" rid="B4">4</xref>
]).</p>
<p>Indeed, we currently rely on self-regulation to control the risk—expecting older drivers to declare for themselves when they are unfit to drive. But the evidence suggests this does not always work—many drivers are not aware of (or do not recognise) their own limitations [<xref ref-type="bibr" rid="B9">9</xref>
, <xref ref-type="bibr" rid="B11">11</xref>
], and they either do not cease driving early enough or conversely cease driving too soon [<xref ref-type="bibr" rid="B17">17</xref>
]. “Because of (a) lack of information, feedback, and insight, elderly drivers are not, I believe, in a good position to determine for themselves when they should reduce or cease driving” [<xref ref-type="bibr" rid="B9">9</xref>
, page 171]. Moreover, as the older driving population grows and becomes more mobile, it is anticipated that mileages will increase, as will the need to face more challenging traffic conditions [<xref ref-type="bibr" rid="B12">12</xref>
]. </p>
<p>We have already said that, per mile driven, older drivers are almost at a similar risk of a crash as young drivers. When the types of accidents are analysed, though, it is clear that older drivers differ from younger groups in that their accidents are less about taking risks, but more about errors of perception or judgement [<xref ref-type="bibr" rid="B2">2</xref>
, <xref ref-type="bibr" rid="B4">4</xref>
, <xref ref-type="bibr" rid="B11">11</xref>
, <xref ref-type="bibr" rid="B14">14</xref>
]. Rather than single-vehicle accidents involving speed, alcohol, or fatigue, older drivers have multiple-vehicle accidents at junctions involving giving way, or when turning or changing lanes. This tends to be due to deficits in “bottom-up” visual and cognitive processing, as opposed to “top-down” failures of experience or expertise [<xref ref-type="bibr" rid="B13">13</xref>
]. Verhaegen [<xref ref-type="bibr" rid="B18">18</xref>
] argues that this decrement in performance is consistent with the notion that cognitive abilities decline with age.</p>
</sec>
<sec sec-type="section" id="sec3"><title>3. Cognitive Factors in Driving Performance</title>
<p>There is a wide body of scientific evidence to suggest that age-related declines in cognitive functions such as attention and decision making can be a source of increased crash risk on the roads (e.g., [<xref ref-type="bibr" rid="B18">18</xref>
–<xref ref-type="bibr" rid="B20">20</xref>
]). Aging leads to declines in many perceptual and cognitive functions related to driving, with visual, spatial, and attentional abilities all having been shown as potential sources of increased risk. Whilst the reduction in driver capabilities with age can be offset with experience [<xref ref-type="bibr" rid="B4">4</xref>
, <xref ref-type="bibr" rid="B21">21</xref>
], as age increases beyond 65 years, fitness to drive (in terms of sensory, perceptual, and cognitive abilities) becomes the most important factor in driving competence [<xref ref-type="bibr" rid="B22">22</xref>
]. It has been shown that older drivers (over 60) are slower, less accurate, and less coordinated in their responses [<xref ref-type="bibr" rid="B23">23</xref>
]. Tsimhoni and Green [<xref ref-type="bibr" rid="B24">24</xref>
] used visual occlusion to demonstrate that drivers over the age of 55 experience more demand during driving on curved road sections, while Brouwer et al. [<xref ref-type="bibr" rid="B19">19</xref>
] found that drivers in their mid-60s were less able to divide attention and integrate their responses in a dual-task scenario. In terms of driving tasks, negotiating junctions and merging traffic are both known to cause particular difficulties.</p>
<p>Undoubtedly, many of the problems that older drivers face are in part due to declining visual capabilities with age, affecting visual search at junctions (e.g., [<xref ref-type="bibr" rid="B14">14</xref>
, <xref ref-type="bibr" rid="B25">25</xref>
]). Typically, it is the ambient or peripheral visual field which degrades [<xref ref-type="bibr" rid="B25">25</xref>
, <xref ref-type="bibr" rid="B26">26</xref>
], leading some researchers to argue for a “useful field-of-view” (UFOV) test to predict driving performance (e.g., [<xref ref-type="bibr" rid="B27">27</xref>
]). One such test has demonstrated sensitivity to crash risk in older drivers [<xref ref-type="bibr" rid="B28">28</xref>
] and shows promise as a screening instrument [<xref ref-type="bibr" rid="B27">27</xref>
]. However, there is a significant body of evidence to show that visual acuity and the UFOV test do not predict all aspects of driving performance (e.g., [<xref ref-type="bibr" rid="B28">28</xref>
, <xref ref-type="bibr" rid="B29">29</xref>
]) and that central cognitive processing plays a key role alongside visual perception and decision making [<xref ref-type="bibr" rid="B5">5</xref>
, <xref ref-type="bibr" rid="B11">11</xref>
, <xref ref-type="bibr" rid="B13">13</xref>
, <xref ref-type="bibr" rid="B18">18</xref>
].</p>
<p>Attention and executive function have both been implicated as predictors of driving performance [<xref ref-type="bibr" rid="B19">19</xref>
, <xref ref-type="bibr" rid="B28">28</xref>
, <xref ref-type="bibr" rid="B30">30</xref>
], with older drivers being more susceptible to errors under conditions of high mental workload [<xref ref-type="bibr" rid="B9">9</xref>
, <xref ref-type="bibr" rid="B11">11</xref>
]. Such cognitive declines are an inevitable part of the aging process: “Age-related decline in cognitive functions such as attention, anticipation, executive functioning and information processing means that older drivers tend to have difficulty in dealing with complex traffic situations and reduced capacity to respond quickly and flexibly to changing traffic situations” [<xref ref-type="bibr" rid="B3">3</xref>
, page 45]. Adrian [<xref ref-type="bibr" rid="B30">30</xref>
] drew upon an established model of executive functioning and a standardised battery of tests to show that this is probably due to older drivers having difficulties with distraction and focusing their attention.</p>
<p>The idea of investigating independent cognitive measures in relation to driving performance in older adults is not new, and although meta-analyses and reviews (e.g., [<xref ref-type="bibr" rid="B31">31</xref>
, <xref ref-type="bibr" rid="B32">32</xref>
]) suggest that tests of visuospatial skills may have some promise, the majority of studies have produced mixed findings. Efforts to develop metrics of individual cognitive abilities as correlates of driving performance have met with varying degrees of success [<xref ref-type="bibr" rid="B11">11</xref>
, <xref ref-type="bibr" rid="B31">31</xref>
–<xref ref-type="bibr" rid="B33">33</xref>
]. In particular, low to moderate correlations between cognitive measures and driving performance make it difficult to distinguish between those who are fit and unfit to drive, and those studies reporting high correlations have not been replicated. Reasons for these discrepant findings include the often small sample sizes, the wide variety of cognitive measures that have been assessed, and the different approaches to assessment of driving performance, their varying realism and their rigour. Thus there remains a “desperate” need for evidence-based guidelines and tests for front-line application [<xref ref-type="bibr" rid="B33">33</xref>
].</p>
</sec>
<sec sec-type="section" id="sec4"><title>4. New Perspectives from Cognitive Neuropsychology and Ergonomics</title>
<p>The most apparent consequence of cognitive decline with aging is reaction time, which is slower for older drivers [<xref ref-type="bibr" rid="B4">4</xref>
, <xref ref-type="bibr" rid="B9">9</xref>
]. Recently though, there has been considerable interest in the cognitive aging field for investigating intraindividual variability, or inconsistency, of reaction time (RT) performance. Such measures index moment-to-moment fluctuations in performance over successive trials of a given cognitive task and are thought to reflect neurobiological integrity (e.g., [<xref ref-type="bibr" rid="B34">34</xref>
, <xref ref-type="bibr" rid="B35">35</xref>
]). Consistent with this view, increased variability is associated with older age (e.g., [<xref ref-type="bibr" rid="B36">36</xref>
, <xref ref-type="bibr" rid="B37">37</xref>
]) and a range of neurological conditions including dementia [<xref ref-type="bibr" rid="B38">38</xref>
] and is a sensitive metric of cognitive function in older adults (e.g., [<xref ref-type="bibr" rid="B34">34</xref>
]). Importantly, measures of RT inconsistency are sensitive to relatively subtle effects when standard measures of accuracy and mean RT from the same tasks are not. For example, recent work [<xref ref-type="bibr" rid="B39">39</xref>
, <xref ref-type="bibr" rid="B40">40</xref>
] found that the cognitive effects of increasing age and mild mental health disorders (anxiety and depression) were detected by measures of inconsistency, but not by measures of accuracy and mean RT. Data supporting the view that inconsistency is associated with neurobiological integrity were produced in a recent neuroimaging study [<xref ref-type="bibr" rid="B41">41</xref>
] of apparently healthy 60- to 64-year olds; RT inconsistency was related to the degree of white matter lesioning in the frontal cortex, whereas mean RT was not. This work has now been extended to demonstrate the same association in 44- to 48-year olds [<xref ref-type="bibr" rid="B42">42</xref>
]. These studies clearly suggest that measures of RT inconsistency are sensitive not only to subtle effects in aging contexts but also to neurobiological integrity. </p>
<p>Meanwhile, ergonomics research into driving performance has developed along parallel lines, with an important and distinguishing aspect of performance being consistency in driving—both in terms of perceptual judgements [<xref ref-type="bibr" rid="B9">9</xref>
] and vehicle control. Bloomfield and Carroll [<xref ref-type="bibr" rid="B43">43</xref>
] pioneered measures of lateral and longitudinal inconsistency in a driving simulator, arguing that these variables were more appropriate metrics of driving performance than traditional measures of mean or standard deviation. Their measures have since been successfully applied in several of our studies in the Brunel University Driving Simulator (e.g., [<xref ref-type="bibr" rid="B44">44</xref>
, <xref ref-type="bibr" rid="B45">45</xref>
]) and clearly distinguish good from poor drivers [<xref ref-type="bibr" rid="B46">46</xref>
], in line with best practice for safe driving which suggests that smoothness and consistency is key [<xref ref-type="bibr" rid="B47">47</xref>
]. Whilst the ecological validity of simulator studies may be called into question, many modern simulators offer realistic and immersive representations of driving and provide a safe, replicable, and controllable environment for studies of this nature. Moreover, with relevance to the present discussion, the higher-level cognitive and performance markers associated with driving are directly testable in a simulator.</p>
<p>Given the conceptual overlap with measures of cognitive inconsistency above, these studies together suggest that measures of RT inconsistency have huge potential in the present context. It is striking, though, that to date no work has drawn these two lines of research together. We believe the parallels between consistency-based metrics of driving and PC-administered measures of cognitive performance provide a promising and innovative basis from which to develop metrics and models that can help us better understand the cognitive limitations of older drivers. Pilot studies in our laboratory indicate that older adults (in comparison to a younger group) exhibit higher inconsistency on a neuropsychological test battery as well as higher inconsistency on driving performance metrics in a simulator. </p>
<p>Future research is planned to investigate and validate these associations in more detail. In terms of their application, there are two options. The first is in response to calls for compulsory screening tests for older drivers: “… instead of asking whether and why older people have more accidents … perhaps we should be asking <italic>which</italic>
older drivers are more likely to have accidents” [<xref ref-type="bibr" rid="B12">12</xref>
, page 45]. Previous assumptions about identifying a threshold age beyond which deterioration in cognitive functioning presents an unacceptable risk to driving have met with limited success, as individual differences make crude age-related cut-offs inappropriate [<xref ref-type="bibr" rid="B1">1</xref>
, <xref ref-type="bibr" rid="B4">4</xref>
, <xref ref-type="bibr" rid="B7">7</xref>
, <xref ref-type="bibr" rid="B11">11</xref>
, <xref ref-type="bibr" rid="B48">48</xref>
]. A more detailed instrument, tailored to individual differences, could be of use for drivers themselves in self-diagnosis, as well as by General Practitioners (GPs) as part of a wider battery assessing medical-psychological fitness to drive. Such cognitive testing could be in addition to existing practices for GP assessments, which include visual acuity, general health, and medications. Anecdotal evidence suggests that GPs are currently uncomfortable with screening patients for driving ability, since they are not experts in driving standards. A cognitive testing instrument, as suggested here and elsewhere (e.g., [<xref ref-type="bibr" rid="B22">22</xref>
]), used in conjunction with standard medical assessment may help reassurance and reliability in these processes.</p>
<p>However, such screening remains contentious and does not accord with the spirit of solving the older driver problem—maintaining safety and mobility. The aim is to prolong independence, rather than try to remove older drivers from their cars. In that respect, we can turn to user-centred design and a raft of technological support systems that are becoming available in cars.</p>
</sec>
<sec sec-type="section" id="sec5"><title>5. Vehicle Technology and Design to Support Older Drivers</title>
<p>Numerous in-car technologies are coming on stream now that could support the cognitive functioning of older drivers (cf. [<xref ref-type="bibr" rid="B3">3</xref>
, <xref ref-type="bibr" rid="B10">10</xref>
]), such as blind spot warning systems, lane keeping assistance, adaptive cruise control, speed limit displays, and collision mitigation braking systems. Nevertheless, such systems are very much a result of technology “push” rather than user “pull”; what is needed is a balanced, user-centred assessment of these technologies.</p>
<p>The user-centred approach would argue that the cognitive limitations of older drivers may be compensated for by technological interventions which support the older driver in maintaining their independence and mobility. For instance, vision enhancement systems could assist visual impairment associated with night-time driving; similarly a head-up display (HUD) could relieve the visual accommodation problems of eyesight in old age. Collision avoidance systems could help with speed and gap judgements at junctions, while adaptive cruise control or active steering could help reduce the demands of challenging driving situations.</p>
<p>Earlier research in this area with younger drivers (i.e., under 55 years) has shown that these systems can reduce driver workload and bring some improvements to driving performance [<xref ref-type="bibr" rid="B44">44</xref>
, <xref ref-type="bibr" rid="B49">49</xref>
–<xref ref-type="bibr" rid="B51">51</xref>
]. Extrapolating such results to older drivers may not be straightforward, though; Waller [<xref ref-type="bibr" rid="B52">52</xref>
] notes that the extent to which “… new technology could assist (older drivers) is not known. Nevertheless, if new technology is designed, taking into account the abilities and limitations of older users, it holds promise of extending the self-sufficiency of many elderly drivers” (page 24).</p>
<p>Lees and Lee [<xref ref-type="bibr" rid="B13">13</xref>
] suggest that emerging vehicle technologies can be exploited to enhance the safety of older and younger drivers, by tailoring such systems to support bottom-up or top-down processing, respectively. Previous research on younger drivers supports this, indicating that advanced driver assistance systems (ADASs) can bring some improvements to driving performance [<xref ref-type="bibr" rid="B45">45</xref>
, <xref ref-type="bibr" rid="B49">49</xref>
], while European projects such as PReVENT and EDDIT [<xref ref-type="bibr" rid="B53">53</xref>
] have explored the potential for extending these findings for the specific needs of older drivers. Moreover, a recent UK project explored this very issue and reported that most new in-car technologies have so far ignored older drivers' needs [<xref ref-type="bibr" rid="B10">10</xref>
]. Using participatory methods, older drivers identified systems that enhanced feedback as having potential to assist their driving. However, this approach could exacerbate problems of high mental workload with older drivers [<xref ref-type="bibr" rid="B9">9</xref>
, <xref ref-type="bibr" rid="B11">11</xref>
].</p>
<p>In particular, the diminished capacities of older drivers could render them more susceptible to overload with poorly designed assistance (cf. [<xref ref-type="bibr" rid="B20">20</xref>
, <xref ref-type="bibr" rid="B48">48</xref>
]). Earlier work in the DRIVAGE project (e.g., [<xref ref-type="bibr" rid="B48">48</xref>
]) set out to evaluate the driving abilities of older people and to examine the potential benefits and distractions of providing additional information to the driver. More recently, a government report [<xref ref-type="bibr" rid="B3">3</xref>
] noted that in-vehicle systems could specifically help older drivers but also cautioned that interface design and divided attention limitations might cancel out such benefits. That said, Horberry et al. [<xref ref-type="bibr" rid="B54">54</xref>
] found that older drivers were no more susceptible to distraction from in-car systems than younger drivers. Moreover, the technological limitations of earlier systems are rapidly being overcome, and new advances in multisensory displays offer enhanced feedback whilst avoiding distraction or overload for the older driver (cf. [<xref ref-type="bibr" rid="B55">55</xref>
]).</p>
<p>Results from the DRIVAGE project [<xref ref-type="bibr" rid="B56">56</xref>
] and elsewhere [<xref ref-type="bibr" rid="B57">57</xref>
] suggest that technological assistance inside the car is only of benefit if designed from a user-centred perspective. More recent research has indicated the potential of developing high technology vehicular interfaces using participatory methods specifically to meet the needs of older drivers [<xref ref-type="bibr" rid="B57">57</xref>
]. This research also highlighted that the theoretical opportunity for a technology to assist with specific limitations of older drivers could not always be accessed by the older driver group for a variety of reasons, including poor user interface design and technology immaturity [<xref ref-type="bibr" rid="B57">57</xref>
]. More research is clearly necessary to develop technologies and interfaces which not only support older drivers but are also acceptable and accessible to the population of older drivers.</p>
<p>Thus we see that, on the one hand we have technological options, and on the other we have the needs and wants of older drivers (e.g., [<xref ref-type="bibr" rid="B10">10</xref>
, <xref ref-type="bibr" rid="B57">57</xref>
]). But so far we do not have a complete user-centred solution based not only on the desires of older drivers but also their objective information processing requirements. To finish, we bring together the themes covered in this paper to argue for a new stream of research addressing the older driver problem.</p>
</sec>
<sec sec-type="section" id="sec6"><title>6. Summary and Conclusions</title>
<p>We have seen that, mile for mile, older drivers are at greater risk of a collision than those between the ages of 25 and 55. One reason for this increase in risk is the decline in cognitive abilities with aging, particularly executive function. But individual differences in the aging process, as well as societal acceptability, make it unreasonable to set an age-related threshold for dictating when older drivers should give up their licence. Indeed, the user-centred solution searches for technologies to support older drivers in maintaining safety and mobility.</p>
<p>There are many technologies offered by vehicle manufacturers now, with more arriving in the near future, that could fulfil this purpose. However, few—if any—of these have been designed specifically for older drivers, and so their benefits may be limited. Participatory research has identified the needs and wants of older drivers when it comes to technology; it is our contention that this is only half of the story, as systems should be specifically designed to compensate for the cognitive decrements associated with aging.</p>
<p>Many researchers have tried to identify those decrements with respect to driving performance, with varying degrees of success. We believe that we have discovered a promising avenue of investigation in the conceptual overlap between measures of intraindividual variability from the cognitive neuropsychology of aging and metrics of driving inconsistency from ergonomics. Future research is planned to explore these overlaps in rigorous empirical studies and to use the output as a basis for specifying technological support systems for older drivers. If we can identify systems to improve consistency in driving, we can go some way to solving the older driver problem.</p>
</sec>
</body>
<back><ack><title>Acknowledgment</title>
<p>D. Bunce received support from the Leverhulme Trust, UK.</p>
</ack>
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