It's meant to better manage loading and unloading in designated zones.
Now, the Philadelphia Parking Authority is expanding it to 30 additional blocks in Center City.
The initiative began a little over a year ago with 22 blocks along Chestnut and Walnut Street.
It will now cover 52.
Drivers have to scan a QR code and use the Curbless app.
The system tracks how long they're parked, charging 10 cents a minute after the first three minutes.
After the warning period, violators could face a $51 ticket.