For those of you in the Chicagoland area, you may have noticed unmarked white cargo vans parked on the side of I-94 or I-294. These harmless looking vans may, in fact, house a
radar gun that will take a picture of your license plate as you're flying through the constructuion zones. While I have not yet heard of any cases where the speeders have been mailed a ticket, with the number of drivers violating the 45 MPH speed limit is astounding. For those of you who are concerned with the abilities and fallbacks of traffic radar, check out the
Traffic Radar Handbook.