Applying Time-to-Collision to Enhance the Coefficient of Determination for GHR Car-Following Model in Deceleration Mode

Alavi, S.S; SAFFARZADEH, M; Nadimi, N; Nadimi, N; MAMDOOHI, A.R

Applying Time-to-Collision to Enhance the Coefficient of Determination for GHR Car-Following Model in Deceleration Mode

Authors

S.S alavi

M SAFFARZADEH

N Nadimi

A.R MAMDOOHI

Abstract

Abstract:
Car-Following models are integral parts of capacity analysis, safety research, traffic
simulation, and developing advanced vehicle control systems. During the past six decades,
various car following models have been developed. GHR is the most well-known stimulus
based model, in which the stimulus is the relative velocity of vehicles. In this research, timeto-
collision (TTC), as the stimulus, is proposed as a substitute for relative velocity in the
GHR model. GHR model is calibrated based on the comprehensive and detailed data gathered
in the NGSIM project on I-80 freeway. The Results of GHR model calibration based on the
data obtained for the two stimuli indicated that coefficient of determination (R2) increased
from 0.233 in the base model to 0.638 in the proposed model. In all, the results indicated that
the application of TTC as the stimulus in the GHR model would improve the model's
outcome.

Keywords

Time-to-collision indicator

Car-following model

NGSIM project

GHR model

Model calibration