A tech-savvy individual reverse-engineered San Francisco's parking ticket system, creating an online map that shows the exact locations where parking enforcement officers last issued citations.

Riley Walz discovered a vulnerability in the San Francisco Municipal Transportation Agency's (SFMTA) online payment system. By decoding the citation numbering system and exploiting a loophole in how ticket data becomes available, he created a scraper that captures ticket information almost instantly after issuance.

"I thought it would be interesting to visualize parking ticket data," Walz explains on his website. His investigation revealed that the SFMTA issues approximately one parking ticket every 24 seconds, with about 300 officers patrolling in small, single-seat vehicles. 00:00/09:18 10

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