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We thank Mr Tan Tong Sin and Mr Keith Wong for their suggestions to implement countdown timer displays at traffic light systems (Can traffic lights at junctions come with timer displays?, Apr 10 and Worth having timer displays for drivers, Apr 13). 

Previously, the Land Transport Authority (LTA) conducted a six-month trial at the junction of North Bridge Road and Rochor Road to assess the effectiveness of timer displays. The results did not show an improvement to safety. It inadvertently increased the risk of accidents as some motorists sped up to beat the countdown timer instead. 

Our findings are consistent with international studies, which have led some countries to phase out traffic signal countdown timers after implementation. 
We would like to assure Mr Tan and Mr Wong that safety is a priority for LTA and Traffic Police. We will continue to study the developments in traffic design and modes of enforcement to improve safety for all road users.