# Different Speed Measurement Devices And Their Limitations

When you are stopped by a cop suspected of violating speed limit most probably he or she use speed measurement devices specially designed to measure speed but it is worth mentioning that sometimes these devices are not well maintained or does not calibrate appropriately. So it is highly beneficial for you to know the weakness and strength of different speeding devices used by police as it may help you in case you got a speeding ticket and your attorney can use these weaknesses in your favour. Radar, Laser gun and VASCAR (Visual Average Speed Computer And Recorder) are the three most common devices that officers use.

Laser Speed Gun:- Laser speed guns work in a different way. These guns figure out the range the official is from a car by shooting a ray of infrared light at the automobile and measure the time it takes for the ray to travel back to the gun. The system does this many times at an extremely fast speed (often 100 periods in 3/10ths of a second) and uses the changes in range to figure out the vehicle's speed.

Weakness: Laser gun result inaccurate when in motion: This means that the police officers must not be motion. Furthermore, the gun must be organized very stable or the reflection of the different sections of the vehicle will make an important mistake in range computation, thus the rate determine will be incorrect. However officers are qualified in techniques to decrease these incorrect parts.

Radar Speed Gun: Radar gun deliver out a radar ray at one frequency, and it bounces back to them off your car at another frequency. The change in frequency is used to determine the rate at which the vehicle is moving. Radar guns work by calculating the impact of the Doppler Impact on radio waves.

Weakness: Mobile or hand-held radar speed gun is only efficient when one shifting item is in the range of view and there are no other moving vehicles near the targeted vehicle. Radar gun must take up a place above or to the side of the road, so the officer can calculate vehicle speed rate as the route changes while a single automobile goes within the area of perspective. Vehicle speed rate and radar speed gun statistics are hardly ever the same for this reason. Radar gun does not work effectively in heavy traffic, and the significant gap between moving vehicles is important for appropriate function when used for speed tracking.

VASCAR: the officer simply measures the time taken by a vehicle between two points. then uses the VASCAR computer to estimate the speed.

Weakness: it is difficult to perfectly push the "time" and "distance" control buttons while monitoring the target on successfully pass between two points, at least one of which is almost sure to be far away from the official. And, of course, doing this perfectly is even more complicated when the patrol car is moving.

If you have also caught for over speeding and got a NJ Speeding Ticket only knowing the weaknesses of various speeding guns can't help you in representing your case. Getting help from an experienced New Jersey traffic attorney actually construct your defense.