Quote Originally Posted by Riff Raff View Post
We have a few of those radar speed limit signs here as well (normally near "School Zones").
When I test drove one, I went thru a school zone. It registered the correct speed. I believe color would have more effect on whether a vehicle registers or not. (Darker colors have been reported to be more stealthy.)

Plus, Police radar is designed to pick up/register the fastest car, maybe the stationary road-side units work similarly.

I've also heard vertical surfaces can play a part. Vette's for example tend to hide under the radar if shot from the front. Not a lot of surface to bounce back from. A VX has plenty of height/vertical surface. I'd be surprised if it didn't register -- especially if you're the faster vehicle.