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The Ironworkers bridge will be a big bottleneck. Here's a snippet from their FAQ about this:
https://www.translink.ca/plans-and-projects/projects/bus-projects/r2-marine-willingdon-rapidbus
What happens during heavy traffic on the Ironworkers Memorial Bridge?
During heavy traffic, accessing the Ironworkers Memorial Bridge, R2 buses may take an alternate route to bypass congestion near the Cassiar Connector. All R2 stops will continue to be served. This is a routine approach already used by other bus routes in the area, including the 28, 130, and 222.