Though the benefit technically ended for solo drivers a few months ago, the Department of Motor Vehicles offered a 60-day grace period that ended Monday. Now, solo drivers face fines of up to $490. With this, most carpool lanes require vehicles with more than two people. Here is what to know: How many people are affected? As of Aug. 14, more than half a million motorists statewide had an active decal on their vehicle to access carpool lanes.