This exact situation has happened to me with a fire truck. I was stopped at the red when a fire truck came up behind me. I was only 18 & had no idea what to do. I panicked for a moment before the truck beeped at me & I ended up pulling into the intersection and moving as far left as I could so the truck could get past. Like in your case, all traffic was stopped so it was safe. The bulk line was well back from the intersection & there was a traffic island to the left. Also it was a T intersection so no traffic could have come from the right. so it was the only thing to do. I think it would be a case by case basis. Every situation would be different.