RADAR
Fadar was invented during World War II to detect enemy aircraft and ships.They use radar detectors that detect if a radar gun is being used nearty.These machines make a beeping sound when they detect a radar gun, and the driver slows down.If the radar guns are checked and fixed regularly, they are an essential tool in helping keep our roads safe.When the waves hit the car, they bounce back towards the radar gun.If the car isn't moving, the radio waves are the same as when they were sent.With this type of radar gun, poboe don't have to stop the speeding car.However, some police officers don't turn on their radar guns until they see a car that they think is speeding if that happens, the radar gun measures the driver's speed before the driver even knows the radar gun is there.Some people claim radar guns can make mistakes and that drivers get tickets when they shouldn't.However, there aren't many mistakes if the radar guns are used correctly and police officers are trained to use them properly.It was used for many other things, Including weather prediction.Police officers started using radar speed guns to catch speeders over 50 years ago.So you can't avoid a ticket by speeding away!