[WANTED] Movie Title

Hi All,

I'm looking for the title of a movie I saw a few years ago...

IIRC, it was a 70' or 80' movie.
A man had his family killed in a car accident by a "professional" Hit and Run driver (in a modified black car)...
So he modified a car (I seem to remember some kind of pickup truck, or 4x4 but I'm not sure) and try to find that driver, listening to the police radio.

One of the car had some metal spears (like ancient Greek chariot) coming out of its wheels to destroy other car...

Any idea ?

ta

Jerry