I followed a drunk driver for over half an hour, calling the State Patrol every time I got back into a spot with signal, from Quincy to Wenatchee. They were swerving heavily all over the road onto the shoulder and then across the center lane. I was behind them in my car at the time, at about 3:00AM. I followed this car into town, while talking with the dispatch. I gave them a description of the car and the license plate number. I gave them turn by turn directions until the guy pulled into his destination.
No officer ever showed up. I doubt they ever did anything. Now I am disgusted every time I see one of the 'we are cracking down on drunk drivers' commercials.
After that experience, a law requiring a 3 foot clearance sounds a lot like something they will care a lot less about.