Would a trail cam work? Also, some localities will do a study for you if you can convince them it's necessary. I emailed my county once about a dangerous intersection near an elementary school, and they performed a study a few weeks later. They put those air hoses across the road. Try to frame it as a safety hazard when you talk to them.
if you live in a city then they should do this for you. alot of cities have open data. if they dont.. the probably still have the data they just dont want to share it with you.
Depending on your technical ability, it might be worth looking at something like this.
https://github.com/jthomas/ai-speed-camera
A camera aimed at the road can be used to gather numbers and speeds.
Proviso, I've not actually played with this one. It's a comparatively easy task for AI however, so I'd be surprised if there weren't several options.
automate data collection of the speeds of cars, number of cars going by
My garmin bike computer + garmin varia radar can do this.
how many actually stop at intersections/stop signs
The thing about cars actually stopping will require either a video camera with a review of the footage afterwards, or a live volunteer.
I don't know about where you live, but where I live this is pretty illegal. I don't like cars either, but you should not be recording the public street in any way whatsoever, even if you only analyze it with a program but don't write it to disk.
This is bad for not just motorists but everyone else. Don't do this.
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