| Cue |
Probability |
| Turning with a wide radius: the distance between the turning vehicle and the center of the turn is greater than normal. |
65 |
| Straddling center or lane marker: vehicle is moving straight ahead with the center or lane marker between the left and right wheels. |
65 |
| Appearing to be drunk: eye fixation, tightly griping wheel, slouching in seat, erratic or obscene gestures, face close to windshield, drinking in the vehicle, driver’s head protruding from the vehicle. |
60 |
| Almost striking object or vehicle: passing abnormally close to an object or vehicle, causing another vehicle to maneuver to avoid collision. |
60 |
| Weaving: moving from one side of the roadway to the other in a zig-zag course. |
60 |
| Driving on other than designated roadway: driving at the edge of roadway, on the shoulder, off the roadway, straight through turn-only lanes. |
55 |
| Swerving: an abrupt turn from a straight course. |
55 |
| Speed slower than 10 m.p.h. below limit |
50 |
| Stopping without cause in traffic lane; stopping without observable justification. |
50 |
| Following too closely; flowing another car without maintaining minimum legal separation. |
50 |
| Drifting: driving in a straight line but at an angle to the roadway. |
50 |
| Tires on center or lane marker; the left hand set of tires is “consistently” on the center line, or either set is “consistently” on the lane marker. |
45 |
| Braking Erratically; braking in an uneven/jerky manner, unnecessarily maintaining pressure on the brake peddle “riding the brakes.” |
45 |
| Driving into opposing or crossing traffic: driving into opposing lane, backing into traffic, failing to yield the right of way, driving the wrong way on a one-way street. |
45 |
| Signaling inconsistent with actions: such as failing to signal a lane change, signaling opposite to the action, driving with hazard flashers etc. |
40 |
| Slow response to traffic signals: a longer than normal driver response to a change in the traffic signal. |
40 |
| Stopping inappropriately: vehicle stops at an inappropriate location or under inappropriate conditions other than in the traffic lane (flashing yellow light, green light, in a crosswalk etc.). |
35 |
| Turning abruptly or illegally: turning with excessive speed, turning sharply from the wrong lane, illegal U-turn, turning outside a designated turn lane. |
35 |
| Accelerating or decelerating rapidly: abrupt stop, breaking traction, acceleration or deceleration more rapid than required by traffic conditions. |
30 |
| Headlights off: driving with the headlights off at a time of day when headlights are required. |
30 |
