California law enforcement, looking for potential drunk drivers, can have their job made easier by how the driver uses his or her driving skills.  Detecting a potentia drunk driver at night is evidenced by some of the following driver mistakes:

1. Accelerating or deaccelerating quickly
2. Inappropriate or constant use of brakes
3. Barely miss hitting an object or another vehicle or pedestrian
4. Being too close to the center line or lane marker
5. Drifting in one's lane
6. Inappropriate signalling, or no signalling at all
7. Tailing another car too closely
8. Stopping at the wrong place
9. Driving too slowly, at least 10 miles per hour under the speed limit
10. Not having headlights on
11. Weaving on the road
12. Making a turn too wide
13. Making sudden inappropriate turns
14. Drive into opposing or cross traffic

The above mistakes don't mean a driver is intoxicated, but they do ensure a road side stop by law enforcement.