Do you ever see a car that’s about to get ticketed or towed and wish you could warn the owner? Or maybe you’re just really sick of people parking like idiots and would love to get in touch with them to let them know exactly what they’re doing wrong. CurbTXT, a new service launching in San Francisco, makes it possible for drivers to communicate with each other anonymously – and we’d love to see it become available in the rest of the U.S.

Drivers have to register with the service and put a CurbTXT sticker on their car. After that, anyone passing by can send a text message to the registered car using the license plate number and the CurbTXT number. The recipient never knows who sent the message but might just avoid a ticket thanks to the helpful sender. And if someone decides to get a little obnoxious with their texts, the recipient can always block that person’s messages.