If you're ignoring people who blow stop signs and red lights you are lazy and a huge part of the problem and are contributing to deaths.

Pulling people over for failing to signal a lane change is just being a jerk.

That said EVERYWHERE people claim they have the worst drivers.  It's all relative and this study is bogus.  It uses a small set of self-selected drivers who were offered an incentive discount on their insurance.

If you're actually a cop why are you ignoring people who blow stop signs and red lights?