Abstract
Intense light from trains can cause glare, affecting the driving safety of vehicles running in the opposite direction at road-cum-railway sections. This study, in particular, examines glare impacts caused by high-speed rail (HSR) illumination on highway traffic driving safety in a road-cum-railway bridge. Field surveys and tests are conducted on the illumination measurement for HSR, and disability and discomfort glare are investigated and quantified, with parameters being calibrated. A simulation-based platform is established and utilised to explore the impacts of HSR illumination on road traffic safety under different horizontal distances and traffic volumes. Different traffic safety risk indicators are utilised to evaluate traffic safety, including time-to-collision (TTC) and weight integrated risk level (WIRL). The results demonstrate that glare, especially disability glare, significantly increases traffic safety risks. The traffic safety of multi-axle vehicles are more negatively affected. The negative effect appears to strengthen with increasing traffic flows and decline with increasing horizontal distance between the high-speed railway and the highway. Anti-glare light barrier installation is an effective way to eliminate the negative effects and appropriate heights of anti-glare barriers are suggested for different horizontal distances.
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