Drivers’ behavioural responses to combined speed and red light cameras
- Published: Accident Analysis & Prevention, Volume 81, August 2015
- Authors: E. Polders, J. Cornu, T. De Ceuynck, S. Daniels, K. Brijs, T. Brijs, E. Hermans, G. Wets
- Date Added: 11 Feb 2016
- Last Update: 11 Feb 2016
To provide a better insight into possible explaining factors for the increase in rear-end collisions associated with the placement of speed and red light cameras (SRLCs)
Real-world observations and driving simulator-based observations were combined.
Video recordings at two signalised intersections where speed and red light cameras (SRLCs) were about to be installed were used to analyse rear-end conflicts, interactions and driver behaviour in two conditions: with and without SRLCs. Furthermore, one of these intersections was rebuilt in a driving simulator equipped with an eye tracking system. At this location, two test conditions (just SRLC and SRLC with a warning sign) and one control condition (no SRLC) were examined. The data of 63 participants were used to estimate the risk of rear-end collisions by means of a Monte Carlo Simulation.
The results of the on-site observation study revealed decreases in the number of red and amber light violations, a shift (closer to the stop line) in the dilemma zone and a time headway reduction after the installation of the SRLC. Based on the driving simulator data, the odds of rear-end collisions (comparted to the control condition) for the conditions with SRLC and SRLC plus warning sign are 6.42 and 4.01 respectively.
The driving simulator identified possible adverse effects on road user behaviour, such as stronger decelerations, and a possible increase in the number of rear-end collisions. However, in the case where the presence of SRLCs is announced with warning signs, these adverse effects are somewhat reduced.
Robust experiment using driver observation and simulator data.