No zones are basically semi truck blind spots. Just like the average passenger vehicle has blind spots, so do big trucks. However, a truck’s no zones are much more dangerous for other drivers on the roads because generally truck drivers can’t see you even with their mirrors. Drivers in passenger vehicles may see you if they turn over their shoulder or look closely in their mirrors before changing lanes. If you’re in a no zone, the truck driver can’t see you at all (even if they look in their mirrors) and you could get into a serious accident if you’re not careful.