Radar Dectector Recommendations?

semtex

Yeah, I know that rearwards-facing radar has been around for years, but here's what I can't quite figure out. (Maybe I'm just being dense on this.) We were going in opposite directions. So imagine he's going west at 60mph, and I'm going east at 60mph. He turns his radar on. Let's just assume for the sake of argument that the time required for the radar to zero itself isn't an issue. What I don't quite understand is, whatever reading his radar gives him, how does he know the radar isn't just bouncing the signal off of a tree he just passed, or building or parked car or whatever. I mean, even if the road were completely empty, if he turned his radar on, wouldn't it bounce off the nearest object behind him? And wouldn't it read 60mph? Because if he's traveling at 60mph, then whatever stationary object the signal bounces off of is, relative to him, moving away at 60mph, right? So did he know I was doing 60 because his radar showed an object moving at -120mph? As you can see, I'm a tad confused.

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