Commonwealth v. Bartley

Opinion by

Mr. Justice Cohen,

This is an appeal from a conviction for speeding under the radar provisions of The Vehicle Code. Since this case calls into question the mechanics of the radar timing system, itself, it is necessary to give a brief explanation of the procedure employed by the state police.

The radar set which timed appellant consists of a radar transmitter and receiver placed in the open trunk of an automobile which is parked on the shoulder of the highway. The transmitter emits a cone-shaped beam of radio waves which extends up the lane of oncoming traffic for a distance of 200 to…