I haven’t ridden since last week due to a nice cold and work obligations, but I was in a MD cab last night going down L. Unfortunately he was clueless and I said you need to get over now trying to explain the bike lanes and he just went right up to the light and then turned left. I think he understood what I was saying after he made the turn, I just suspect this will be an ongoing issue for quite a while.
As for the 15th St question. I waited for the red figuring those with the red clearly can’t make that turn on a red. The only trouble with this approach is then merging into those going north or avoiding/waiting on those going south that are already on the cycletrack.