Every now and then (probably once or twice a month), I happen to notice an unattended white panel van parked on I-95 entrance & exit ramps with orange cones around it. There is some type of sensor that is set up on the ground - along with a vehicle counter or camera-type device.
Is this for some kind of emissions testing? It appears to be positioned so that it can read license plates of passing cars and trucks.
I have seen it as far south as Fredericksburg and as far north as Springfield - near the infamous 'mixing bowl' where I-95 joins 495 and 395.
Anyone know what it is and what their purpose might be? Do they mail tickets if you have too much smoke coming out of the tailpipe?

** Oops! Sorry, Admin; I should have posted this in the 'Virginia' section. My bad. **
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