Cars are creating a safety issue, but it's the trail users that get barricades. Each intersection should be redesigned to better address the issue without compromising trail safety.
OK. Here's my recommendation.
Below is the current situation at
Lakeshore and Rememberance, showing the movements that are permitted while cyclists have a green light.
Cars are in red, bicycles are in blue and pedestrians are in yellow.
The solution is to ban all turns while the MGT has a green light. That's not as big a deal as it sounds, because most turns can easily be moved to other parts of the signal cycle.
In order to provide access out of the Ontario Place parking lot without taking too much green time away from Lakeshore Avenue and the MGT, each intersection will have only two signal phases. That isn't enough phases to accommodate all turning movements without conflict, so I had to restrict some movements.
At Rememberance Drive, I've banned left turns off Lakeshore. That movement is accommodated at Newfoundland Dr. instead.
There can now be two conflict-free phases:
At Newfoundland Drive, I've banned left turns onto Lakeshore. Westbound access out of Ontario Place is provided at Rememberance Drive, and access eastbound out of the Ex is provided at Manitoba Drive.