Theory of Operation:

VASCAR-plus is a programmed computer that measures speed, dividing distance travelled by the time it took to travel the distance. The device, may be mounted in the police car, motorcycle or airplane. When the suspected speeder’s car passes a point determined by the officer he flips a switch. When the suspect’s car passes a second point, the officer turns the switch off. Elapsed time is automatically recorded by the computer. The officer measures the distance by throwing a switch when his car passes the first point and turning it off when the car passes the second point. The police car is used only to measure distance and its speed is not a factor in determining whether or not the suspect is speeding.

Due to the fact that the VASCAR-plus computes speed simply by dividing the distance travelled by the elapsed time, it can be used in a wide array of situations. Also because it measures the average speed and requires no depth perception judgements, it is fairer to the driver than other forms of speed measurement because it’s an average speed not peak speed.

Today’s speeders are even better equipped to avoid detection than law enforcement officers are to catch them. RADAR detectors, RADAR jammers and cloaking devices have made the job much harder today. The advanced microprocessor technology of the VASCAR-plus cannot be located by radar detectors nor can it be jammed.

The five situations outlined below are the most typical uses of the VASCAR-plus. In each, the operator gets a direct reading of average speed and an instant recall of distance of elapsed time simply by pressing a button.

Basic clocking methods:


The officer flips TIME switch ON when target vehicle passes point “A”, then OFF when it passes point “B”.  He then flips the DISTANCE switch ON as the police cruiser enters point” A” and OFF when he reaches point “B”.  The calculated average speed is immediately displayed.

Opposite Direction

The officer flips the TIME switch ON when she sees the target vehicle pass point “B”.  When the police car is opposite the front of the target vehicle (point “A”), she flips the TIME switch ON, and simultaneously flips the DISTANCE switch ON.  When the police car passes point “B”, she turns the DISTANCE switch OFF.  The calculated average speed is immediately displayed.


The police officer drives from point “A” to point “B” with the DISTANCE switch ON at point “A” and OFF at point “B”, and then parks off the roadway. As the target vehicle, viewed through the officer’s rear view mirror, passes point “A”, he turns the TIME switch ON. When the target vehicle reaches point “B”, the TIME switch is turned OFF. The calculated average speed is immediately displayed.


The police officer is parked off the main roadway out of the driver’s normal view. As the rear of the target vehicle passes point “A”, the TIME switch is turned ON. The police vehicle then enters the road and upon passing point “A”, turns on the DISTANCE switch. The officer now proceeds to follow the target vehicle until it passes point “B”. At that time, the TIME switch is turned “OFF”. When the officer passes point “B”, he turns “OFF” the DISTANCE switch and the calculated average speed is immediately displayed.


Having previously measured the distance between “A” and “B”, the police officer parks her vehicle in a position of maximum concealment, yet where reference points “A” and “B” are clearly visible.  She now dials the DISTANCE in on the thumbwheel switch.  By using only the TIME switch, she can repeatedly clock cars until she observes a flagrant speeder.