The *ONLY* way a radar will get an accurate lock is when the trail is free and clear. Of course, speed really isn't the issue, it's poor judgment of cyclists, runners and walkers. Until there is a cure for narcissism, all the laws anyone can dream up will not give us a solution.
My wife and I went for a short run yesterday morning on Katy. We stopped at Knox for a drink of water. There was a guy with his hand leaning on the edge of the water fountain. I said excuse me, he didn't respond. Wife got a drink, then I proceeded to take a drink. At this point, he seemed shocked and offended that I was drinking so close to him as he retreated.
People really don't pay attention when they are on the trail. I'm shocked this is the first time we've seen an accident this serious.