ITSC 2025 Paper Abstract

Paper WE-EA-T14.3

CHOI, EUNJIN (Korea Road Safety Authority), Han, HyangMi (Korea Road Traffic Authority)

Effects of Red Signal Remaining Time Information on Driver Reaction and Start-Up Behavior at Signalized Intersections

Scheduled for presentation during the Regular Session "S14b-Human Factors and Human Machine Interaction in Automated Driving" (WE-EA-T14), Wednesday, November 19, 2025, 14:10−14:30, Currumbin

2025 IEEE 28th International Conference on Intelligent Transportation Systems (ITSC), November 18-21, 2025, Gold Coast, Australia

This information is tentative and subject to change. Compiled on October 19, 2025

Keywords Human-Machine Interaction Systems for Enhanced Driver Assistance and Safety, Vehicle-to-Infrastructure (V2I) and Vehicle-to-Vehicle (V2V) Communication Applications for Traffic Management

Abstract

This study investigated the effects of providing red signal remaining time information via an in-vehicle information system (IVIS) on driver behavior at fixed-time signalized intersections. Two key behavioral metrics were examined: brake reaction time and start-up lost time. Field driving experiments were conducted along a predefined route comprising 13 intersections, with 4 fixed-time signalized intersections selected for detailed analysis. Each participant completed two test runs under different conditions: baseline driving without signal information and driving with a red signal countdown displayed on an in-vehicle screen. Brake reaction time was defined as the time difference between the signal phase change and the driver's brake release, whereas start-up lost time referred to the time from the onset of the green phase until the vehicle exceeded a threshold speed of 3 km/h. The results showed that providing signal information significantly reduced the brake reaction time from 0.41 s to 0.036 s (p < 0.05), demonstrating enhanced driver anticipation. However, the corresponding reduction in start-up lost time, from 1.8191 s to 1.6770 s, was not statistically significant (p = 0.134). However, the increase in anticipatory responses did not lead to premature vehicle movements, which indicates that the signal information improved readiness without inducing risky driving behavior. These findings support the potential of red signal countdown information to enhance driver responsiveness in intelligent transportation systems without compromising safety.