|
Abstract:
|
This research investigated differences between four age groups using events from SHRP2-NDS in in Washington and Florida. As a first step, researchers modeled speed of choice (SOC). Facility type, traffic density, and especially the posted speed limit were found most influential to explain differences in free-flow driving. As a second step, researchers calibrated a dynamic mixed-effects model to car-following situations the parameters to vary between four age groups: 16-19 years; 20-39; 40-69; and 70 years and older. The introduction of different sets of lag operators in the independent time series allowed modeling average reaction times for each age group. Compared to other age groups, younger drivers were found over-sensitive to relative speed (between lead and following car), and following gap as the magnitude of their speed adjustment due to these factors was found largest. Additionally, a consistent trend in adjusting car-following speed toward the predicted free-flow SOC was found for all age groups except for younger drivers.
|
