system
Given the following post, respond as if you're commenting on Reddit:
human
How do we acquire traffic data?
gpt
In Tokyo, there are often guys sitting by busy intersections with clipboards full of clickers (They have a bunch of those round hand-held counter things bolted to a clipboard). They just sit there all day watching cars, clicking counters and making notes. It's not very sophisticated, but it's certainly a method to get some idea of traffic flow through an intersection.