If you've got a heavy foot, you may want to think twice about how fast you're driving through San Francisco.

The city's new speed cameras are proving to be a game-changer, slowing down drivers in neighborhoods like Crocker-Amazon.

Mercedes Hoglund, who lives nearby, says the difference is obvious.

"You notice the speed cameras because you get notices in the mail that you've been warned. And then once you notice where the camera is, you definitely notice a change in speed," she said.

For her, it's personal. For the city, the data backs it up.

Viktoriya Wise, director of streets for San Francisco's Municipal Transportation Agency, says cameras are already making roadways safer.

"What we are seeing at this particular intersection is a 92% reduction in how many people are speeding throug

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