Neighbor Regularly Drives Home Drunk And I've Had Enough.

Location: California. My in-laws live very close to us and do a huge amount of childcare for us. Their nextdoor neighbor (single middle-age male, works from home) regularly drives home drunk late at night, blasting music and obviously way beyond driving limits in a huge huge pickup truck. He was arrested for a DUI in his driveway last month but I guess he can keep driving because he hasn't had his court date yet?

Yesterday was the last straw. He drives home at 5:30pm in broad daylight completely blasted. Parks the car on his lawn (missing his driveway) and passes out in the driver's seat without even putting the car in parking gear.

Multiple neighbors come out of their houses, try to wake him up with no success, and when the car starts rolling they put the car in park themselves and drag him out. Someone calls 911 but the police say that if he is out of the car they can't give him a DUI(?). By that time he had already stumbled into his house.

The worst part is that there are many elementary school age children (including mine) who regularly run across all the lawns and driveways down that end of the street when playing and going to each other's houses, biking in the street, etc. So it is very likely he will one day turn someone's child into scrambled eggs or go through my in-law's living room.

Apparently one of the neighbors videoed the whole incident on their phone (not sure why, probably to show him later and try to shame him), so I'm hoping to get a hold of that. My concern is that I've known enough alcoholics to know his behavior won't change, but I can't wrap my head around the idea that someone has to be killed before anything is done about him. Lord knows what he's up to today with all the Superbowl parties. What steps if any can I take to make the street safe?