Squeaky Wheels: Synchronizing traffic lights is a multi-year project

Q I know this has been brought up time and time again, but seriously, I don’t understand why the city of Montreal can’t synchronize the traffic lights on major roads and boulevards. Not only would it improve traffic flow, but it would also reduce pollution and the aggravation of waiting an entire red light just to drive into another one. Is there any reason why the city refuses to do this?
Joseph Lapenna, Lachine
A The short answer to the question of light synchronization is the