Smile! You're on Candid Camera (and you owe us 150 bucks)

The City of Portland has been using photo radar for the last decade or so to catch more speeders in trouble areas around town. They drive a van or another vehicle, or sometimes pull a trailer, to a location, position the camera and the radar gun, then leave it alone for a few hours to rack up the revenue. The photos are reviewed by the department and matched to DMV records, then tickets are signed by the reviewing officer and mailed to the offenders. Some of the vans have a large, digital display that tells drivers how fast they're going - ostensibly to give them a "chance" to slow down before being nabbed...

This particular van was parked on a 35 mph street, but cars were conspicuously driving faster than that limit. It was then that I saw that the readout said 1 and didn't change. I'm guessing that there weren't too many tickets issued that day.