Accidents involving 18 wheeler and semi-trucks are typically much more catastrophic than accidents between comparably-sized cars. A fully loaded commercial truck can weigh over 80,000 pounds while the typical car weighs only about 3,000 pounds. The laws of physics dictate that a collision with a large truck can be disastrous, often resulting in serious injuries or fatalities. Also, semi-trucks may carry dangerous or hazardous materials that may compound the severity of the accident.