California motorists are 21 percent more likely to be killed or injured in an alcohol-related crash on St. Patrick’s Day than they are on other days, according to an analysis released in time for the holiday honoring Ireland’s patron saint.

The study by the Auto Club of Southern California found the risk of being involved in a drunken-driving accident jumps on March 17 by 21 percent in Los Angeles County, 19 percent in San Diego County and 64 percent in Orange County.

Despite the higher risks drivers could face Sunday, most police departments in Los Angeles and Orange counties deploy no special enforcement efforts to crack down on drunken drivers. The free taxi and shuttle rides often offered on New Years Eve are rare on St. Patrick’s Day.

Several law enforcement officials said most of their special enforcement efforts are rolled out for other heavy-drinking holidays, including New Years Eve and Labor Day.