http://emfsafetynetwork.org/stop-radar-in-cars/A couple of things occurred to me as I read this:
The proposed frequency of transmission of these things is MUCH HIGHER than that of a smart meter. According to most estimates I am familiar with, smart meters pulse every 20-30 seconds. In order to serve the purposes for which they are designed (i.e., preventing high speed collisions between automobiles) these things will be pulsing 10 times per second. So if you are sitting in a car with one of these things you are in a death zone.... I was only mildly EHS until a smart meter was installed downstairs from my bedroom in 2003, at which point I experienced a host of negative symptoms, many of which persisted for a year, and I still retain a relatively significant degree of EHS to this day which all traces back to that smart meter exposure.
Additionally, it seems to me that even eschewing a vehicle with the radar transmitter installed would not really be a satisfactory option since you will be constantly bombarded by the transmissions from virtually every other car on the road every time you travel as this technology is implemented on a wide scale.