Not fully appreciating the dangers of semi trucks is a common failing among motorists. This is caused by a lack of awareness of the truck’s limited braking and swerving ability, their large blind spots, and other limitations. Driving near semi trucks is dangerous. Here are five reasons why: Trucks Cannot Stop on a Dime Semi trucks are up to twenty times heavier than the average car. Although they have more wheels and therefore more brakes than a car, they require more braking distance. Pulling too closely in front of a.