Third wheels provide stability and extra traction.

This could be a Farside cartoon.

Doesn’t look bad to me!

I think this caveman really was streets ahead.

Image Transcription: Twitter Post

Uncle Duke, @UncleDuke1969

caveman: wanna go hunting with me?

wife: can I bring my sister?

caveman: no, she’d be a third wheel

wife: a what?

caveman: never mind, just something i’m working on