San Francisco’s 33 speed cameras have been installed and tested for weeks now, and Friday marked the start of the official warning period for violators.

The San Francisco Municipal Transportation Agency said on social media Friday that the city issued more than 31,000 warnings in April alone.

Those warnings apparently were off-record during the test period, and on-record warnings began Friday. Citations will be issued starting Aug. 5, the SFMTA said.

Drivers will fined according to the following violations: 11-15 mph over the posted speed limit, up to $50; 16-25 mph over the limit, up to $100; 26-plus mph over the limit, up to $200; and 100-plus mph, up to $500.

Aiming to change behavior, the SFMTA said it’s starting to see results even in the warning phase.

“For some of our cameras t

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