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A comparison of self-nominated and actual speeds in work zones
journal contribution
posted on 2015-11-01, 00:00 authored by Ashim DebnathAshim Debnath, R Blackman, N HaworthDespite significant research on drivers' speeding behavior in work zones, little is known about how well drivers' judgments of appropriate speeds match their actual speeds and what factors influence their judgments. This study aims to fill these two important gaps in the literature by comparing observed speeds in two work zones with drivers' self-nominated speeds for the same work zones. In an online survey, drivers nominated speeds for the two work zones based on photographs in which the actual posted speed limits were not revealed. A simultaneous equation modeling approach was employed to examine the effects of driver characteristics on their self-nominated speeds. The results showed that survey participants nominated lower speeds (corresponding to higher compliance rates) than those which were observed. Higher speeds were nominated by males than females, young and middle aged drivers than older drivers, and drivers with truck driving experience than those who drive only cars. Larger differences between nominated and observed speeds were found among car drivers than truck drivers. These differences suggest that self-nominated speeds might not be valid indicators of the observed work zone speeds and therefore should not be used as an alternative to observed speed data.
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Journal
Transportation research part F: traffic psychology and behaviourVolume
35Pagination
213 - 222Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
1369-8478Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2015, Elsevier Ltd.Usage metrics
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