Doug: You are correct. There are way too many variables. I had to guess some numbers. The formula is far to variable to do much more than analyze a crash 'AFTER' it happened. Or at the least, draw up a whole series of 'what-if's'. .5 seconds is likely slow to hit the ground and was a very slow motion 'guess'. However, you understood my point. More or less, a speed limit will not make the trail safe. The 'news' and 'leaders' are trying to sell safety to citizens with an imposed speed limit; which as you pointed out isn't guaranteed. No matter how many laws they impose upon civilization, people are still going to die in freaky accidents.

Of course, it was pointed out that slower moving objects WILL increase time for people to react. IS that time enough? I don't know. For all we know the actual impact for this woman on Katy was 5mph, I've yet to be able to find that speed.