F=M X a I believe this is Newton's second law. Deaths can go down but physics still rule. I bet you will also disagree with the first law of gravity. Unbelievable
The U S Department of Transportation keeps data on traffic accidents including the Fatal Accident Reporting System (FARS) with fatalities since 1975 which number over a half million (averaging 45,000 per year in the US). Each year there are about 18 million property damage crashes with 1.7 million injuries. The risk of accidents for young drivers is greater in all categories of accidents, 18 yr olds having 400% more accidents than 40 yr olds. Analysis of such data permits reasonable estimation of factors which influence safety such as vehicle mass and the use of seatbelts. Some interesting human factors come into play. For example, given a severe crash, the driver of a 900 kg car is about 2.6 times more likely to be killed than the driver of an 1800 kg car. But overall data indicates that 1.7 times as many drivers of 900 kg cars are killed, compared to 1800 kg cars, indicating that drivers of light cars are more cautious and less likely to have such accidents. In seatbelt statistics, it must be factored in that persons who choose not to use seatbelts are more likely to have accidents out of a higher general bent toward risk taking.
Source: Leonard Evans, "The Science of Traffic Safety", The Physics Teacher 26, October 1988, Page 431.
Trucks: more likely to 'win' in car crash
Phil Frame, a spokesman for the National Transportation Safety Board, said that while large trucks are not part of most deadly wrecks, "they are overrepresented in the number of fatal accidents they are involved in."
In 1997, they accounted for 9 percent nationally of all vehicles in fatal wrecks, but accounted for only 3 percent of all registered vehicles and 7 percent of total vehicle miles traveled, the national transportation statistics show.
"The greater mass vehicle almost always wins in a vehicle crash", Frame said.
78 percent of the people who died after collisions with big trucks were occupants of the other vehicle, and 75 percent of the people who were injured were in the other vehicle."
Excerpts from "Facts counter fear about big rigs", by Jennifer Brett, Atlanta Journal.
Spokesmen for the trucking industry are quick to point out that truck drivers are better trained, and safer drivers than the general public - and that is believable. But just the physics of collisions dictates that the occupant of the less massive vehicle is more at risk when a collision does occur.
Just because you have seatbelts, air bags, etc., etc. the oak tree is still going to win. However, I would take my chances in my 2500 diesel over a small box car any day.