What is the legal status of 'lane splitting' or 'lane filtering' for motorcyclists in Ontario?

1. It is legal during heavy traffic congestion if done at a speed no more than 15 km/h faster than surrounding traffic.
2. It is permitted only at intersections with traffic lights to move to the front of the queue.
3. It is a legal grey area but generally tolerated by law enforcement.
4. It is not legally permitted and can result in fines and penalties.