Welcome wadecool.
Could you go into a little bit more detail about your driving route?
Is it pretty much the same, day to day? Do you travel by any airports on a routine basis?
Do you notice certain vehicle makes when these alerts occur? The reason I ask this one is that newer vehicles equipped with Adaptive Cruise Control (ACC) and Lane Departure warning systems often rely on either radar or lidar (laser) based systems to function. I found this to be true when the Audi Q9 with Side Assist.
Furthermore some vehicles like Lexis can set of laser detectors when their rear brake lights are activated.
Veil Guy