If I recall right, speeding is responsible for a majority of traffic deaths and injuries while DUI is a close second. Police departments receive grant money to place emphasis on speeding, seat belt enforcement, red light running, etc. and it seems that once the grant money is gone, so too is most of the enforcement.
DUI checkpoint scheduled for New Year's Eve in Tulsa
https://www.tulsaworld.com/news/local/crime-and-courts/dui-checkpoint-scheduled-for-new-year-s-eve-in-tulsa/article_5a22fddd-0499-5864-a8cd-8688cab610fb.html
Law enforcers from 10 agencies will band together New Year's Eve to prevent drunk driving and stop those who have been drinking and driving.
Municipal, county and state law enforcement will conduct saturation patrols and a checkpoint on New Year's Eve in Tulsa and Creek counties. Oklahoma Highway Patrol Trooper Russell Callicoat said the sole goal is to prevent and stop drunk driving....and the thousands of dollars in citations written at every prior roadblock for everything unrelated to DUI wont happen at all this time, we promise, and we wont shut down just because the grant that pays our overtime runs out.
This year, of course, everyone with a Medical Marijuana card (or in the OMMA database) is an automatic DUI.