I REFER readers to the following link on road safety. http://safety.fhwa.dot.gov/policy/memo071008/#yellow
The topic I was attracted to in this link is the item regarding the timing of traffic lights – especially the yellow/amber lights, and how it reduces the frequency of collisions at intersections.
What I notice is that on the highways and roads in Trinidad and Tobago, the timing appears to be arbitrary, with no specific policies applied.
Sometimes, road users are left wondering whether the traffic lights/timing/sensors are working at all, because of the unusually long delays.
I also find that in many cases the traffic light timing can be varied to suit the time of day to the benefit of all road users, but that this either is not considered in the design or is just not working.
Keith P Dass