Impact of Red-Amber-Green Arrows at Traffic Junctions

65 Mr Melvin Yong Yik Chye asked the Acting Minister for Transport whether the LTA has studied the impact of the installation of Red-Amber-Green (RAG) arrows at traffic junctions on the flow of traffic; and (b) if so, what is the median time increase in waiting time for vehicles to turn right at these junctions.

Mr Jeffrey Siow: Since 2018, the Land Transport Authority (LTA) has progressively implemented Red-Amber-Green (RAG) arrows at more than 1,200 traffic junctions. Right-turn accidents at sampled junctions decreased by about 40%.

LTA evaluates the impact of RAG arrows at traffic junctions through comprehensive traffic monitoring, data analysis and simulation. The waiting time for vehicles to turn right at sampled junctions with RAG arrows increased by about 20 to 40 seconds, depending on the junction characteristics and time of day. This is a 30%-50% increase in waiting time.