DON'T DO THIS!
When you try to catch yourself you end up landing straight armed driving all the force of the crash into your collar bone, often resulting in a break. This is why cyclist often break the collar bone.
If you can have the presence of mind to remember this in a crash, try to keep your arms tucked in and let your shoulder absorb the impact with the ground. You might get some extra road rash, and it's no guarantee that you won't cause other injuries, but you will be less likely to break anything this way.