The force that compels any given driver to remain faithful to the lane they have chosen despite the other lane(s) appearing to move faster.
Other names for this are "fear" or "laziness".
A common enemy of the loyal and a good cause of passive aggressive driving
is the merge hopper
"...H-hey, where are you going? You just merged in front of me 2 minutes ago! Don't you have any lane loyalty?! I DON'T WANT TO SIT HERE ALONE"