This paper describes the results of a study performed with the interactive fixed-base driving simulator of the Inter-University Research Center for Road Safety aimed: a) at analyzing the driver behavior in car-following situations in different traffic-flow conditions and b) at providing the first elements to choose the most appropriate threshold value of Time-To-Collision (TTC) in order to discriminate unsafe from safe car-following behaviors. A test alignment 8.5 km long and 4 different traffic scenarios were implemented in the simulator. Thirty-two subjects drove in the simulator. Several values of threshold were used to quantified advanced TTC-based indicators. The results highlighted that: 1) the car-following behavior is significantly affected by the volume-to-capacity ratio; 2) the most efficient threshold values of TTC seem to be 2.5 and 3s. These results should be considered for the development of Collision Avoidance Systems
Bella, F. (2010). Driver behaviour in car-following: a driving simulator study. In European conference on Human Centred Design for Intelligent Transport (pp.545-555). LYON : HUMANIST publications.