Interesting. I wonder how this affects your car using Autopilot, or other Teslas using AutoPilot behind you.
There's no interference with Autopilot. Autopilot's radar is millimeter wave (70-77GHz), while police radar is more in the microwave spectrum (33-36GHz, 24GHz, 10GHz). There is no approved police radar operating near Autopilot's range. And Autopilot doesn't use LIDAR.
Note that with LIDAR, the biggest problem is actually interference with police laser jamming, not with the car itself. Jammers recognize and precisely defeat the pulse pattern of specific laser guns, so they won't randomly interfere with something it was not programmed to defeat (including self driving cars and laser adaptive cruise systems). However, such systems will spew random noise that your jammer needs to filter out.
At any rate, without going into the specifics of the systems in use, I know if anyone has attempted to read my speed or not. And for my last 10,000 miles of driving in California, that's not happened at all.
All I'm saying is, don't get too comfy with the "well I see others violating the HOV lane all the time and they seem to be fine" mentality. California ticket prices are set such that all it really takes is 1 or 2 enforcement stings a year to make you pretty miserable and regretful about your choices. I'd much rather the enforcement be more regular and ticket prices be lower, as I think this current way is a great cash grab for law enforcement but does not do much in terms of encouraging the average driver to obey the law.