“Dear PoP,
Saw several of these in the 395 tunnel. There was construction, so the traffic was actually slow enough to notice them. What are they?”
Hmm, vehicle detector – I’m completely stumped – anyone know?
“Dear PoP,
Saw several of these in the 395 tunnel. There was construction, so the traffic was actually slow enough to notice them. What are they?”
Hmm, vehicle detector – I’m completely stumped – anyone know?