In the near term, there are no immediate alternatives to replace 540,000 barrels a day of crude oil and natural gas liquids. In the longer term, you would have to build rail off-loading facilities and truck off-loading facilities in those states and provinces to replace the pipeline. Obviously, that takes time. You need to find a site. You need permits. You have to build that infrastructure.
Along with that, you would have to build new railcars that are specially designed for crude oil or NGL. Those railcars aren't available right now. You would also have to build new trucks to carry all that crude and natural gas liquids to market.
A shutdown of Line 5 would cause an immediate shortage of energy in the region. It would drive up prices very significantly. The replacement of that would be years away.