Comment by arjie

There's something you can learn from the broad scale, but SF has pretty decent tracking and perhaps there's something you can learn from looking at one city too. SF has a Collisions Report[0] and also traffic citations data is open data[1] so you can see how enforcement has changed. Subjectively, I notice a lot more red-light running, and objectively the red-light camera near my apartment illuminates the ceiling of my home office every day.

I'm now a father so one cannot discount the amount to which my tolerance of bad actors has changed, but my experience has been that the lack of enforcement for violations (right-turn red lights in SF are rarely obeyed) is definitely taken advantage of by many drivers. However, the collisions report does make it somewhat clear that a non-trivial amount of the new fatalities are due to new traffic modalities: people now have the stand up OneWheels, and there are many more food delivery drivers on e-bikes.

But one gratifying thing is that the newer parts of town where people are having children have a lot more safety construction. I was walking home from the gym here in Mission Bay when I saw a group of kids between 6 and 12 on their little scooters.

[0] https://www.visionzerosf.org/wp-content/uploads/2023/05/San-...

[1] https://www.sfchronicle.com/bayarea/article/car-traffic-pede...