There were 8,481,999 registered “large trucks” or tractor trailers traveling the interstate highway system as of 2005. http://tiny.cc/2of2jw A large truck is defined as a truck with a gross vehicle weight of rating of greater than 10,000 pounds. This information was compiled by the U.S. Department of Transportation, Federal Motor Carrier Safety Administration (or “FMCSA”). The typical tractor trailer combination weighs approximately 80,000 pounds. The typical passenger SUV weighs approximately 4,000 – 6,000 pounds.