Don't give them any ideas . . . I've seen bio-kinetic reports where the cause of death or injury was the impact of the heads of two occupants striking each other.
On a related note:
"Unbelted riders can turn into deadly bullets"
"Hundreds of Americans are killed and thousands injured each year because unbelted back-seat passengers become human projectiles in frontal collisions, a study by the University of Buffalo and the Center for Transportation Injury Research says.
"An unbelted passenger seated behind the driver turns into a "backseat bullet" that increases death risks for the driver and passenger, Dietrich Jehle, an emergency medicine professor at the university and a researcher for the study says.
"The odds of death were almost three times higher for the unbelted passenger and two times higher for the driver under those circumstances," Jehle said.
"The study concludes that more than 800 lives could be saved annually and 65,000 injuries prevented if 95 percent of rear-seat occupants used belts.
"In analyzing 300,000 fatal crashes from seven years, researchers found that 33 percent of rear-seat occupants older than 16 and 62 percent younger than 16 were belted.
"Crash tests conducted with instrumented dummies at the center’s Buffalo, N.Y., research facility showed that, when a frontal crash propels an unbelted rear passenger into the driver, the forces on the driver’s head and chest increase four times.
"Our hope is to get all people to wear seat belts in the rear seat," Jehle said. "If people start to get a mind-set that the unbelted person behind me is trying to kill me, they would have a different perspective."
"The National Highway Traffic Safety Administration says 79 percent of front-seat occupants buckle up, but the agency does not measure rear-seat restraint use among all motorists, only in fatal accidents.
"NHTSA data from 2002 show that 63 percent of rear-seat passengers killed in cars were unbelted, versus 47 percent of front-seat occupants, indicating fewer rear-seat occupants use belts.
"NHTSA is pushing states to adopt strong seat-belt laws that cover all occupants, but Washington is the only one that requires everyone be belted regardless of age or where they’re seated."
http://www.aiada.org/article.asp?id=23117