DETROIT (AP) - An insurance industry study finds that vehicles equipped with automatic braking or front-collision warning are less likely to cause a rear-end crash.

DETROIT (AP) An insurance industry study finds that vehicles equipped with automatic braking or front-collision warning are less likely to cause a rear-end crash.

The Insurance Institute for Highway Safety says automatic braking can reduce rear-end crashes by 40 percent. Front collision warning which warns the driver that a crash is imminent but doesn't brake cuts the risk of a rear-end crash by 23 percent.

The institute measured the systems' effectiveness by looking at police records for 7,490 rear-end crashes in 27 states. They only considered crashes caused by Acura, Honda, Subaru, Mercedes and Volvo vehicles that offered optional automatic braking or forward-collision warning. Then they compared the performance of the vehicles with the optional systems and those without.

Forty percent of vehicles currently offer automatic braking.