This might be the relevant quote: > The police found the minimum speeds to be essentially unenforceable, observing that drivers were passing more on the right,

This might be the relevant quote: > The police found the minimum speeds to be essentially unenforceable, observing that drivers were passing more on the right, a quarter of all motorists didn't even notice the signs, and 13% of citations issued for minimum speed violations indicated that drivers confused “minimum” for “maximum.” Striking, IMO, that their conclusion was "unenforceable". That might be the main take here: California highway patrol obsesses on some rules and just plain doesn't bother with others. So in practice there is no risk to grabbing a lane - any lane - and acting as if you own it.