Radar collision avoidance system- looking for aftermarket system

I am hoping someone may know of an aftermarket radar system to sense the car ahead and warn the driver he is approaching it to fast.
I know some manufactures will have this available on the new cars in the future, but I am trying to find a co. that may have a system I can buy and install in an older car.
If anyone has a clue please let me know. Thanks in advance, Mike
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