I do that, it's called the express lane at the grocery store!
The thing about lane splitting is it doesn't cause the rest of the traffic to go any slower and if everyone who didn't lane split had to sit in line as well it would mean that there is more traffic, so it would go slower, so while the other people at the grocery store might not like you walking past them so you can go to the express lane (10 items or less) I'm sure they would rather have you do that then stand in front of them with everyone else who only has a few things to ring up, causing the whole works to slow down.
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