The yellow stickers are a requirement by the state of California to drive solo in the carpool lane. The only vehicles that qualify are natural gas vehicles, electric vehicles (plug-ins), and hybrid vehicles that get at least 45 mpg and have low emissions: Honda Civic Hybrid 1 & 2, Honda Prius 1 & 2, and the older Honda Insights. Unfortunately no other hybrids qualify. So the woman who ripped off someone's hybrid stickers and put them on her accord could be ticketed for illegal use of the carpool lane because her vehicle does not qualify. They might also ticket her for illegal use of the stickers -- if they were stolen from another vehicle.