Keep hands in the vehicle at all times...

[ajfd]

I came across this today and thought it was neat.
Apologies if it is a re-post... I did a search here and didn't see it referenced.

Ever wonder how they validate a design to ensure riders can't hit something when on an attraction?

Rider envelope testing on 7DMT:

 

[Dan Murphy]

Interesting.

Another view.

http://disneymagicwdw.weebly.com/news/envelope-testing-on-7dmt

 

[JZCubed]

I believe that I once read that Shaquille O'Neal could not hit his outstretched hands against anything if he were riding Big Thunder Mountain Railroad.

Being far shorter that Shaq, I am one of those folks who have their arms outstretched when riding BTMRR.

Alas, I have never touched a thing.