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How ENRADD Works? - Speeding Expert:

The ENRADD device uses infrared technology,  utilizing a method similar to gap time / vascar concerning a timing theory between two (2) points with a known distance,  e.g. perpendicular roadway sensors.

The ENRADD system (EJU-91) was approved by Penndot under 75 pa C.S.  3368 (3) / PA Bulletin 33 number 31.

ENRADD Speeding Ticket - Trial Preparation:

Review all the document(s) / data. Police Officers that issue ENRADD speeding tickets /  violations are "Experts" in the operation of the aforementioned devices. Logically the best defense, is to retain an "Expert / Expert Witness" in  this exact field. The expert  should be an engineer, that is familiar with gap time / vascar speed measuring device (certified speed measuring device operator / instructor), police training , vehicle characteristics, certified vehicle technician/ mechanic, as well as court rules.  




75 §3362, 75 §3736

State Statutes for  Speeding*   (ENRADD)

We can derive, of course in a very elementary form, the following: (i) d d = d2 - d1 d: distance  (ii) d t = t2 - t1 t: time (iii) v = d d/d t; v: velocity.

The police officer / trooper observes the target vehicle (yours / defendant) and engages / disengages the unit.  He/she reads the speed display of the ENRADD digital display. - By Perry Zucker

Police ENRADD - Standard Operating Procedure:

The police officer / operator performs a series of set-ups tests, which may assist the operator in determining if the device is operating. The police officer / operator should be trained in this speed measuring device.

Distance Between The Sensors

Distance between two built-in timing sensors points.

Speed  Accuracy

Depends on the set up and operation.


Discrepancies in accuracy may occur from the device and/or by police officer.

Gap Time / Vascar device

Police ENRADD Speeding Expert Witness

We offer ENRADD experts that can provide site investigations, review of all material, as well as expert witness testimony concerning the police speeding ticket / probable cause traffic stops that are in question; nationwide.

Police Traffic Stops

Reasons for Probable Cause Stops

Most "Probable Cause" traffic stops are  reason(s)


Testimonials / Reviews



If you have been pulled over for PROBABLE CAUSE while traveling in your vehicle , call the best EXPERT WITNESS to help defend you. Much of his work is concentrated on speeding due to radar , laser or pacing methods utilized by police. If you want a tough , highly successful Expert Witness , then call Perry Zucker !! - CR


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