Transportation expert quoted by AP

Cameras tucked into orange barrels videotaped the license plates of thousands of drivers on Interstate 35 as part of a Texas Department of Transportation study of the busy highway, officials said. The 21 camera points scattered along the I-35 corridor between Dallas and Mexico included two in Central Texas, one north of Round Rock and the other in Kyle. The cameras caught both north- and southbound cars, agency spokeswoman Gaby Garcia said. Chandra Bhat, a civil engineering professor at the University of Texas Center for Transportation Research, said similar surveys have been conducted in numerous states. Bhat said the drawbacks include problems with the data quality of a survey based on videotaping license plates and the possibility of a negative public perception.

The Associated Press
State Recorded License Plates as Part of Transportation Survey
(Oct. 11)