Toronto did a great job in traffic enforcement. I remembered that we were at a traffic light junction, and heard ambulance sirens at a distance. At that point every single car self-immobilized itself, even at a green traffic light, to give way to the ambulance. After the ambulance drove away a certain distance, the cars started to roll.
The HOV lane (high occupancy vehicle lane), also called carpooling lane or express lane, is also interesting. This lane is reserved for car of 2 people or more, including driver. During rush hour, the lane can still move at a good speed, as compared to the parallel lanes. There was a car in front of us with only 1 driver, using the HOV lane. Soon after, he was stopped by the traffic police.