Does any one know???

[catman-do]

Ive always wondered why they have the "no lane change" on the 40 just after comming into AZ... Anyone know what thats about, and what those things do that kind of look like infra-red cameras are all about?? Hardly ever see the weigh station open on that side, didnt know if it was to weigh trucks coming through or what?

[Not So Fast]

Good question, something to do with in cab transponders ?????????? NSF

[Cole Sanger]

Some trucks have transponders in the cab. They get a signal to either stop or not stop. Nothing to worry about.