Heading eastbound on 463 at the intersection of 463 and Vine.... sure, there's a left-hand turning lane but the light doesn't have a left-turn arrow. So, one is required to pull forward into the intersection (and during busy hours) hope there's enough time to gun it on to Vine. Either that or wait until the light goes red, and while stuck in the middle of the intersection make the left hand turn illegally.
Here's a very simple answer: Left turn arrow! Duh. Even a 6 second arrow would speed this process greatly.
As it is, during heavy traffic, one car can turn left (at best) per Green/Yellow/Red sequence.