I see this all the time. I feel like it must be a Southern thing because I never saw it in Wisconsin. It doesn't even make sense. Why stop that far behind the white line? It reminds me of Denver, where most all traffic lights were motion/weight sensitive and you had to move ahead of the white line for it to ever register. So drivers like that wouldn't even be able to get around town. And it's not even those first drivers, but at least by me, it's every vehicle. Guy in front stops 20' behind the white line; guy behind him leaves 20' of space, etc. I've seen 2.5 car-lengths of space before. Sometimes it can really cause issues when you've got block-to-block lights yet only four vehicles are taking up all the space. Or when there's a turn lane people could move into if only the vehicles ahead could just move up. And most frustrating is when you're that vehicle that wants to move into the turn lane, but the car ahead of you is blocking your entrance yet they have 20' of space in front of them. Will they be nice and move up to let you through? No, of course they won't.