Overhead sensor on highway. What is it?

We have transponders in our trucks. They allow us to bypass weight stations.

 

Grab our details and weight if it has those rolling scale under it. Weight station give us the green light to bypass or red to pull in.

 

Sometimes that thing makes the truck slow down.....

 

It's a brain scanner. Next up will be a ray gun to zap the brain dead drivers out there.

 

The system only works for truckers that pay a monthly subscription.....Basically it connects to the FMSCA/DOT and responds with info, where you are and if you have an unsafe driving record.

http://www.prepass.com/Pages/Home.aspx

 

It checks to see if we've showered or not. If we haven't, we are forced to pull in. so every time you see trucks slowing down to go in...

 

In Pennsylvania up on I 80 they have thise and they clock your speed and then the sign lights up and tells you to slow down

 

Seriously, the image you posted is for truck weigh stations and a "pre-pass" system, as was noted in post #2. But there are similar readers along busy roadways that "read" various ez-pass and other toll tags mounted in windshields. This system is used to monitor traffic density and average travel times where under-pavement sensors systems do not exist and there are many toll tag users available to "monitor" on non toll roads.