"They'll have a little bit too much to drink, no one will say anything to them and let them get into their car, and they'll drive," says Lt. Manny Romeral of the Los Angeles Police Department.
"So, there are quite a bit of drunk drivers on the road even during broad daylight, which is amazing, but it's an unfortunate fact," he added.
If officers smell alcohol, or if the driver appears impaired, police will conduct field sobriety tests, and those who fail will be arrested, their cars will be impounded, and their passengers will have to get another ride home.
Several suspected drunk drivers had children in their vehicles.
People driving with a suspended or revoked license will also have their car towed.
Those who abide by the law don't mind the slight delay on their trip home.
"I think it's a good idea; it helps to keep everything and everybody safe," says George Kovacs, a motorist.
So far this year, there have been 66 DUI-related accidents in the San Pedro harbor area and 434 hit-and-runs. Police are hoping to keep those numbers from climbing over the Labor Day weekend.
"Enjoy the weekend, enjoy life, but just don't drink and drive, because if you do, we'll be looking for you," warns Romeral.