Originally Posted by
CCrew
I commute into DC via the W&OD trail, which is a major commuting route on the west side of DC. Several times a year I do see "counters" out sitting in lawnchairs with clipboards, and also seen the black tubing gizmo's that attach to a box chained to a pole so I assume they're counting something! Or not, but they're giving the appearance that they are
Originally Posted by
cooker
We have occasional visual counts, and of course those (?) pneumatic sensor tubes across the road, which I assume can distinguish different vehicle types.
I think those just count the amount of vehicles on the road. I saw the inside of one once (mid 90s, so they might have changed) and all they did was change a dial similar to a pitch counter occasionally seen used by baseball coaches.