The following is a list of symptoms in descending order of probability that the person observed is driving while intoxicated. The list is based upon research conducted by the National Highway Traffic Safety Administration (NHTSA): Turning with a wide radiusStraddling center of lane markerAppearing to be drunkAlmost striking object or vehicleWeavingDriving on other than designated highwaySwervingSpeed more than 10 mph below limitStopping without cause in traffic laneFollowing too closelyDriftingTires on center or lane markerBraking erraticallyDriving into opposing or crossing trafficSignaling inconsistent with driving actions Speeding, incidentally, is not a symptom of DUI; because of quicker judgment and reflexes, it may indicate sobriety. Some of these accusations may also result in other Massachusetts criminal traffic charges, such as Operating to Endanger, or Reckless Driving. I frequently defend against these charges also, when in conjunction with drunk driving arrests.