Field Notes
Blog.
Research summaries, working notes from the analysis pipeline, and opinionated guides for riders who want to actually use what their camera captured.
5 min Three-foot rule
How often do drivers actually leave three feet?
Thirty-plus US states require it. The data on whether anyone follows the rule is grim, and inconsistent.
4 min Engineering
Lateral clearance is the right metric. Depth isn't.
Every public dashcam clip you've seen showing a close pass is reporting the wrong number. Here's why we don't.
6 min Infrastructure
Rural two-lane roads are where the worst passes happen.
Crash data and field studies say the same thing. The infrastructure conversation is mostly urban; the deaths aren't.
5 min Guide
You filmed a close pass. Now what?
A short, opinionated guide to actually using your incident report when you talk to police or the driver's insurer.