For the most part, car drivers greatly appreciate it when we give big obvious hand signals letting them know our intentions beforehand. At a stop light, when everyone is waiting for the green light, I look all around me and make a BIG signal letting everyone know which way I'm going to go on the green light (and of course i'm in the left part of the lane if I'm planning on making a left). If I plan to go straight I make a big pointing straight ahead gesture with my whole arm, twice. I see so many drivers nodding and smiling when they see my turn signaling. It's so much safer to be visible and make big gestures.