'Black box' for cars a surprise

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No one disputes that Michelle Zimmermann lost control of her 2002 GMC Yukon as she drove on a two-lane highway in Massachusetts one snowy afternoon last January. Her friend died after the sport utility vehicle slammed into a tree.

Miss Zimmermann said she was driving within the posted 40 mph speed limit, but like millions of other Americans the 33-year-old didn't know that her vehicle had a "black box." Monitoring her driving, it recorded the last few seconds before the crash.

Bolstered by data they say indicates Miss Zimmermann was driving well above the speed limit, prosecutors have charged the Beverly, Mass., woman with negligent vehicular homicide. She has pleaded not guilty and faces up to 2 years in jail if convicted.

An estimated 25 million automobiles in the United States now have event data recorders, a scaled-down version of the devices that monitor cockpit activity in airplanes. Like aviation recorders, automobile black boxes mainly receive attention after an accident.

The devices' primary function is to monitor various sensors and decide whether to fire air bags. Since the 1998 model year, all new cars from all manufacturers have been required to have air bags and so most such recent-model cars have the devices. But secondary and more recently installed features in many recorders store data from a few seconds before a crash.

Though capabilities vary widely among carmakers, most recorders store only limited information on speed, seat-belt use, physical forces, brakes and other factors. Voices are not recorded.

But the devices are finding its way into courtrooms as evidence in criminal and civil cases, leading some privacy advocates to question how the recorders came to be installed so widely with so little public notice or debate.

"It's like having a government agent driving around in the back seat of your car," said Bob Weiner, Miss Zimmermann's defense attorney and a former prosecutor. "I think it's a tremendous invasion of privacy."

Most people apparently don't even know whether the vehicles they drive are equipped with event data recorders. Nearly two-thirds of people surveyed by an insurance industry group knew nothing about them.