This also deters the user from speeding between two lanes of traffic that has stopped ... a deed that carries with it some risk and that probably irks some drivers.
https://i.redd.it/59jp81szfdy21.jpg
A bicyclist likely would have lost their legs, if they survived at all.
Meanwhile, the risk of lanesplitting is that might sideswipe somebody and need to pay to get their paint fixed.