Investigating the crash interaction of younger and older (Y-O) drivers
Many studies have identified that older (O) and younger (Y) drivers are the most at risk age groups on U.S. highways; however, little information is available on the interaction of the cohorts. It would seem that the characteristics that make the two groups most risky would be compounded in situations where the two types of drivers meet on the road. As expected, statewide analysis of Y-O crashes, using VMT as a sole measure of exposure, reveals over-representation; however, when adjusted for over-involvement of Y-O drivers as groups, Y-O crashes are actually under-represented. Causal factors such as passenger load and type of roadway geometry are also investigated. Spatial and temporal variation of Y-O crashes reveal that some Iowa counties are over-represented and that 3:00-4:00 p.m. is the most represented hour for Y-O crashes.