New to road cycling here. Ive mountain biked for a few years, but this new addiction has me shook every time a car comes whizzing past me. The courteous folks, the ones who slow down and move over don't bother me (I have noticed you can hear the difference as the approach you from behind). But, the cars who stay straight and don't slow down still makes me extremely nervous. Side note: I had a good friend struck by a car and killed a couple years ago, so that still resonates within me each time a car approaches.