Well we know it was likely an act of arson that started the fire underneath the 10 freeway bridge over the weekend.

What we still don't know yet is whether that bridge will be torn down completely or repaired ... and how long it will take.

We're looking ahead to what could very well be a long-term closure. 

So what will be the best alternatives to that stretch of the 10-freeway in East LA ... and is LA Metro's trains and buses up to the task to help carry commuters around it?

Joe Linton is editor of Streetsblog LA.