The warning period has begun for new "smart loading zones" along 30 blocks from Bainbridge to Spring Garden streets.
Over the next month, drivers will be reminded that they have to register with CurbPass and be charged 10 cents a minute to park in these areas. Otherwise -- or if they park longer than an hour -- they'll be hit with $51 tickets.
The zones use license-plate reading cameras for enforcement.
The program started last year along 22 blocks in Center City.
The Philadelphia Parking Authority says it's reduced double-parking and allowed traffic to flow more smoothly.
