I'm more concerned about some Volvo and Subaru drivers, have noticed when driving behind them that they often do moronic things that they think are polite and generous. For example, if someone in an oncoming lane is signaling to make a left turn, or someone coming out of a parking lot to the left is waiting to make a left and enter traffic, some will actually STOP to let the person go, such that someone behind them who isn't totally attentive might slam into them, oblivious to the notion that right-of-way customs exist so that other drivers can expect predictable behavior. I imagine they think they're being social-minded, befitting their choice of vehicle, while actually creating a dangerous situation.