Automotive parking sensor detect obstructions behind you and also in front of you, it can aid your parking and reversing also enable you to get into those tight spots without crashing your car. They can emit a cone of sound behind your car which bounces of obstructions behind and returns to the sensor.
The time taken for these sound waves to bounce and return off obstructions behind your car is how they measure the distance behind you. And then control well for whether they could park or reversing at this limited distance. This is the same technology that you will be familiar with having seen fitted as OEM equipment on cars from new and are supplied trade to many bodyshops.
What Will You Get From Parking Sensor?
Apart from some obvious safe advantages, financially rear parking sensor will pay for themselves if it prevents you from having just one accident. Regardless of your insurance there is always that "excess" on your policy. It will also help you park in confidence in front of people without damaging your pride. you can retrofit any car or truck with ultrasonic parking sensors to aid you or someone you know with the task of parking their vehicle.
Whether to help the one who crashes into the garage wall, or you would just like an extra safety factor when the big rig is in reverse. Thus, vehicle parking sensor is the "assistance" you've been looking for. Better than a curb on the garage floor, if your rear view mirror monitor stays mounted on the car, so it's always there to aid the driver with reversing and parking. Despite where the vehicle travels, the parking sensor kit will be there to let your driving become more safely!
Reference: http://visitkevin.wordpress.com/2010/08/23/carparkingsensor/
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