I have never thought about the correlation between the severity of injury in car accidents and the amount of congestion on the highway. But it certainly makes sense that (1) traffic jams lead to more accidents because the traffic is stop-and-go, and (2) high traffic means low speeds, which means less serious accidents.
A new study bears this out. Washington, D.C., which includes Maryland for the study, has the worst congestion in the United States. But the cost of car accidents is low compared to the rest of the nation. Some car accident lawyers like to pretend that there is no correlation between the impact and severity of injury because people get seriously hurt and killed in accidents with little property damage. But common sense tells us that serious accidents are likely to lead to more serious injuries and more deaths.
The overall national cost of accidents – which includes the fender benders, the medevacs, the lawsuits, and the lives lost, was estimated at a whopping $300 billion a year. Statistics like this are a little dry, but $300 billion is an amazing amount of money.