The following link offers the citizen some visual cues which can aid in the detection of a drunk driver, thereby helping one to hopefully avoid a confrontation/collision with same. If a motorist suspects a car is being driven by a drunk driver, the motorist should:

	Not pass the car;
	Keep a safe distance;
	Notify the police as soon as possible;
	Give an accurate description of the vehicle to dispatch;
	If possible, follow the vehicle and update dispatch with current location;
	Supply dispatch with personal information to aid in the prosecution.

Go here for more details of Driving Under the Influence!

Guide for Detecting Drunk Drivers at Night

What's Driving You?

Drinking and Driving

Court TV's Legal Cafe: Drunk Driving

TEAM DUI - Pa. DUI Association