There is already a Third Crossing. The train bridge crosses the Inlet about 200m East of the Ironworker's Bridge. The track runs within 100 m from Esmond Skytrain Station. "Coast Mountain Express" Squamish to Seabus in 30 minutes, or Squamish to Skytrain in 45. Oh yeah … the train has room for bikes, gear and other junk.
I can see that being beneficial to Squamish in a similar vein to how the West Coast Express transports professionals from the 'burbs to Vancouver and home each day but it would not be a substitute to daily driver/transit traffic back and forth across the inlet.
Never mind track rights (a huge issue with West Coast Express that prevents expansion of the service) that bridge is also going to have to open a lot more once Kinder Morgan's pipeline "twinning" project is complete and ocean traffic has right of way.
Anyways, what I obviously meant was a forth crossing not including Seabus (which rapid transit would replace), red canoes, amphibious cars, etc should bring rapid transit to the Shore.
The time savings alone would get people out of their vehicles especially if centres like Parkgate, Edgemont, etc were connected to the mainline by rapid buses.
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