Do police clock people by radar bouncing off the lisence plate?

Question

I was reading on a website that was saying that when Police use their radar for speeding cars the radar will hit the lisence plate and bounce back to tell them their speed.
Is this true? It kinda makes sence but I was just woundering.

Answer 1

No, not true.

Part of the reflected signal may be from the license plate at random.

The biggest problem with radar guns is taking reading at an angle and multipath caused by other vehicles.

Where I live the county can't afford radar so they fake it by pointing hair dryers at people. It fools the tourists.

Answer 2

The police clock the speed of the vehicle by using the Doppler affect. What is the Doppler affect? It goes like this, "a radar gun is used to direct a pulse of energy toward a vehicle, the pulse bounces off the vehicle is then returned to the radar gun and a pulse detector determines the time required to transmit and receive the pulse. This time can then be translated into the speed of the vehicle. It is important to understand that for the most part this is a reliable method to determine a vehicles speed. However; there have been instances where the defense attorney has been able to make the argument that the pulse was bounced off the hub cap speed, which when compared to the vehicle's speed can be substantially higher. There is very little likelihood that this would ever happen.

Answer 3

A radar beam exits the unit in a cone shape. This cone is 21 degrees wide. It does not take long before it covers the entire lane of travel. It is going to reflect off the entire car, not just the license plate. They will, however, aim for the plate, as it is a flat, reflective surface.

The beam leaves at a preset frequency. If the beam strikes a stationary object, it does not change. If the object is moving, the frequency changes at a known rate. The relected beam returns to the unit. The unit then calculates the change in frequency, and displays a speed. This change is the constant, regardless of if the vehicle is moving closer, or further away.

A laser, on the other hand, leaves at a 3 degree angle. At 500 feet, it is less than two feet wide. That can be bounced off a license plate, or headlight.

Answer 4

Radar will bounce back off of any flat surface facing the radar gun. While I am sure some of the radio waves bounce back off of the license plate, that is not the only surface they bounce back from. You might want to consider that here in Arizona, radar works great, even though front plates are not used.

Answer 5

the only type of anti radar speed gun to actually work is to not speed in the first place, those speeds are there for a reason, and that's to keep people safe, you may be able to turn a corner faster than posted but if you had to slam on your breaks going around that corner at that speed would you survive?

Answer 6

No, radar work off a dopler principal. A lazer will work in teh above manner, but you dont have to hit their front plate to get a reading

Answer 7

License plate is a contributor. Check the bottom of the following link for radar detector and jamming summary:

http://www.a2dvoices.com/realitycheck/radar/index.html

The bottom of the following article describes the newer traffic camera threat and how gps can help you: http://www.a2dvoices.com/realitycheck/gps/TomTomGPS.html

Answer 8

No, the entire car reflects the radar waves back to the gun.

Answer 9

The flux capacitor requires 1.21 gigawatts of electricity to operate.
the operator accelerates the car to 88 miles per hour which activates the flux capacitor. The car disappears in a flash of blue light, leaving fire trails; observers outside the vehicle see it explode and disappear,


..........I think that's how it works....But I could be wrong...

Answer 10

That's what they say. If you ask me that's darn good aim from 2 miles away!