Forty percent of motorists caught by the 15 million dollar red-light camera system in Los Angeles weren't sent traffic tickets during the last year because drivers or license plates couldn't be identified.
Police figures show at least 1.1 million dollars lost from unissued traffic citations. Officials had expected an 80 percent citation rate.
The Police Department says for that each $381 red-light ticket given, the city adds about $157 to its coffers.
Glare from windshields and license plates interferes with about two percent of the camera images.
But the biggest obstacle has been outdated or unidentified vehicle registrations.
The bulk of violators who weren't ticketed were driving vehicles registered to people who no longer own them.