http://www.delta-optimist.com/news/delta-open-for-business-1.985101
"[Project Director] Freer provided an update on the bridge that is to replace the George Massey Tunnel, a span that is expected to be complete by 2022.
Noting construction is to begin in three years, Freer couldn't say if the new bridge will be tolled, but [Mayor] Jackson said out of fairness she's in favour of having all crossings in the region tolled as long as the rates are reasonable.
Saying the bridge would be a cable span, in the range of eight to 10 lanes, Freer said it would also likely accommodate future light rapid transit.
He dismissed claims the existing tunnel has another 50 years of useful life, saying in the next 15 years major seismic and other upgrades would be needed.
Freer also said a new Highway 17A interchange would be examined, but they're still at the stage of figuring out what the new span should look like. An environmental review will take place over the next year.
Freer described the current tunnel, which sees some 80,000 vehicles travel through it daily, as a "mess." He said it needs to be replaced with a more reliable crossing that will look similar to the Alex Fraser Bridge."
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No one is claiming 10 lanes is a -prerequisite- for light rail capability, least of all the project director.
This is basic CYA (cover your ass).
The bridge could be any width and allowances would still be made for light rail, otherwise you would have opposition members bleating about how idiotic it was to build a bridge to last 100 years without that foresight (and they would be correct).