PG pole cue gap timing / VASCAR, in the context of assessing the velocity of a moving vehicle, typically entails measuring the duration required for a vehicle to traverse informational data between two or more cue points.

Mechanism of Gap Timing:

Two or more cue points

Vehicle Timing
Determining Speed of target vehicle(s)

Cue Points:
Two or more markers.

Timing the Vehicle: 
Employ a timing device.

Practical Considerations: 
- Accuracy 
- Env Factors 
- Technology

Applications of Timing: 

Traffic Enforcement:

Method: 
Law enforcement personnel establish markers to ascertain vehicular speeds.

Highway Monitoring:
Method: 
Automated systems utilizing cameras and sensors positioned at markers on highways can determine vehicular speeds.

School Zones:
Method:
In school zones, authorities may place markers to monitor speed compliance during school hours.

Defense for Timing Speeding Tickets: 

An expert / expert witness concerning a speeding citation that involves timing is an individual with extensive knowledge in timing technology, traffic regulations, or law enforcement practices. The principal function of this expert is to present professional testimony in legal proceedings regarding the accuracy and proper use of timing devices employed in the issuance of speeding tickets. This testimony may serve to either affirm the legitimacy of the speeding tickets or contest the reliability of the timing equipment and the procedures adhered to by the law enforcement officer.