The BMW sensors are fairly expensive (as expected on every BMW part) but not terribly so. Yep, the collision avoidance sysems are expensive but so is an accident.

I was thinking it'd look odd with cars traveling the PA Turnpike, weaving all over the road automatically. There has been a few times that system would have been handy. We drove from NJ to Little Rock and back on the 3 day weekend to pick up my friend's wife & dog. Coming back on I-40, just into TN, there was a pothole the size of a hub cap and looked about 4 to 8" deep. I managed to swerve around it but must have surprised quite a few drivers. I almost missed seeing it because of about 20 to 40 cops lined up in a speed trap. TN must have been low on funds in 1975.