Two-thirds of Americans would support the installation of devices that prevent cars from starting if drivers are impaired -- assuming such technology is reliable -- according to a survey from the Insurance Institute for Highway Safety (IIHS).

The survey also found that 40 percent of respondents said they would like such devices installed in their own cars if that option was available. Some drunk-driving prevention experts would like to see the so-called ignition-interlock devices installed on all vehicles. About 180,000 of the devices are currently installed in the U.S.

"The results are clear-cut and a bit surprising," said IIHS researcher Anne McCartt. "We didn't expect to find support across the board for the idea of detecting alcohol in everybody, but this survey tells us people are ready to crack down on all impaired drivers, not just those who've had DWI convictions."

McCartt said that while the current devices are "unwieldy and intrusive," versions that would be more appropriate for all drivers (not just those convicted of DWI offenses) are in the works.

The IIHS found that 84 percent of about 1,000 people surveyed supported the devices for convicted drunk drivers. Among nondrinkers, 74 percent said the devices should be installed in all cars, compared to 66 percent of weekly drinkers and 50 percent of respondents who said they drink alcohol four or more times weekly.