Why do motorcyclists hold their arms straight out?

In many videos where I have seen a person on a motorcycle get pulled over. They tend to pull out their wallet and other things that they're carrying and they hold them out in front of them in an unnatural and uncomfortable manner. I'll elaborate furthermore if I'm not describing this well enough. via /r/motorcycles https://www.reddit.com/r/motorcycles/comments/at220e/why_do_motorcyclists_hold_their_arms_straight_out/?utm_source=ifttt