I have two Rhode islands red chickens that are around 15 weeks old. I have their coop in my backyard very close to the fence but sometimes very load cars drive by my house and they hear them and get really scared and start running. This doesn't happens very often but sometimes. I'm afraid when they get older they won't lay eggs because I heard that chickens need a quite place to lay. Should I be worrying? I live in the city btw, does anyone have the same problem? should I move their coop in a different place but they're used to it am afraid.