If you are involved in a traffic accident with a big rig, you are more likely to suffer serious injury or death. Why is this the case? Very simply, 18-wheelers are considerably bigger and heavier than other vehicles and when they hit your car, they hit your car with more force. In addition, the size of commercial trucks makes it more likely that your car will be wedged underneath a truck or crushed during a truck rollover. While rear-ending another small vehicle on the highway can result in minor injuries, rear-ending a truck on the highway could involve the trailer of the truck smashing through your windshield.