go to TSSI home page
Company Profile, Background and History
How does VASCAR-plus® work?
Features and Benefits of VASCAR-plus®
Products and Services Available
Request More Information
Technical Support

Flashing Police lightbar

How does VASCAR-plus® work?

Home > How it works

Speeding motorist stopped by Officer using VASCARTheory of operation - VASCAR-plus® is a programmed computer that measures speed, by dividing distance traveled by the time it took to travel the distance. The device, which is the size of a small radio, 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 another 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 his 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.

Because VASCAR-plus® computes speed simply by dividing the distance traveled by the elapsed time, it can be used in a wide variety of situations. And because it measures average speed and requires no depth perception judgments, it is fairer to the driver than other forms of speed measurement.

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

The five situations described here are the most typical uses of 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.


P - Police car

T - Target car

"A" and "B" - reference points on the highway

Note: The officer decides the reference point.  Reference points in the highway are such common sites such as: cracks in the roads, shadows from trees or poles, overpasses, bridges, lane markers, crosswalk markers and etc...


Basic clocking methods:


Following - 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.

using VASCAR-plus® while following
VASCAR-plus® can calculate the speed of cars approaching from the opposite direction
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.
  Parking - 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.
VASCAR-plus® works while parked
checking a suspect's speed from a T-intersection
T-Intersection - 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.
Dial-A-Distance -  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.
using the Dial-A-Distance feature of VASCAR-plus®

send e-mail to Vascar Salesto contact us:
Traffic Safety Systems, Inc.
3206 Lanvale Ave.
Richmond VA 23230
804-353-3826 vox
804-358-0498 fax
ask for Vascar Sales

We accept VISA and MasterCard for purchases or repairsWe now accept VISA and MasterCard
for your convenience
to make it even easier to purchase

copyright 2000 - Traffic Safety Systems, Inc. - last edited on 11/14/2004 23:31