SAN FRANCISCO (AP) — San Francisco’s new crackdown on a mobile app that allows people to auction off their public parking spots marks yet another clash between innovative technologies and regulators trying to maintain law and order, public safety and a sense of social decorum.

The app, called MonkeyParking, allows drivers who score a notoriously hard-to-get San Francisco parking spot to sell it for $5, $10, even $20 and then hang out there until the buyer arrives to take their place.