Models for Preferred Time Headway of Drivers and Interrelationship with Fundamental Characteristics of Traffic Flow


Primary interest in driver reaction time stems from its use in microscopic traffic simulation models. in this paper, we propose a new approach to estimate driver reaction time from car-following data. Using the concept of steady-state car-following, the proposed method captures the interaction of a pair of leading and following vehicles to determine the of a driver's reaction time. the car-following data uses speed and acceleration rate of the leader and the follower as well as the follower's space headway. the paper analyses two sets of Next Generation Simulation (NGSIM) car-following data and 157 reaction times of drivers are obtained. Moreover, the relationship between instantaneous speed of drivers and their reaction times are presented. the results indicate that the driver reaction time is driver dependent and speed independent which are consistent with previous studies.

Meeting Name

18th IASTED International Conference: Modelling and Simulation


Civil, Architectural and Environmental Engineering

Keywords and Phrases

NGSIM; Reaction Time; Instantaneous Speed; Steady-State Car-Following

Document Type

Article - Conference proceedings

Document Version


File Type





© 2004 ACTA Press, All rights reserved.

Publication Date

01 Jan 2004