Truckers often complain about the four-wheelers. That is you and I in our personal automobiles. Trucking accidents were down in 2004 by the number of miles driven per accident. However they were slightly up as 11% more trucks are on the road because the economy picked up and more products had to be delivered to the consumer, that's us too. This is a huge issue of cars mixing with truck traffic and it has been studied to death. Probably due to the deaths, which can result. I can tell you having driven some 500,000 miles around the country in a 72 Foot Indy Car Truck and Trailer that when you are on the open highway and you separate the speeds of cars and trucks by too much for example trucks drive 55 and cars drive 70 you are asking for an accident to happen. There are many places in this country where the speed differentials are like this. What happens is that cars try to pass at bad times adjust for the trucks and end up causing an accident. Thanks for reading: