Disagree, a yield sign means drivers don't even slow down unless something bigger is actually in the intersection. It's the micro transgressions, like rolling through stop signs, rolling right turns on red lights, and rolling through flashing pedestrian crossings while they're still occupied that cause a lot of problems. Why can't people just stop - it's not like you're pushing the car and need the momentum. Here's how I do it on my motorcycle - if I come to a stop sign my bike must be at a full stop, with my foot on the ground. If my foot doesn't stop on the ground, I know I've broken the law and rolled through. Cars need some means beyond eyesight and arse sensation to tell the driver that he's come to a stop, or hasn't.
Cameras like this could be installed on many stop signs.