john in la

There are 3 readers mounted above the road by a scale. When the truck passes the first reader it logs the company; truck #; ect ect.
As the truck comes to the second reader it sends the driver a green or red light; that tells him if he needs to stop at the scale for a random check.
If he gets a green light he can bypass the scale and the third reader records this.
I really do not know the charge for the service but I have heard some say they pay XX per month and others say they pay XX per scale passed.

It was set up to allow know companies with good records to by pass a scale. This cuts down on wrecks as the slow moving truck has to re-enter after weighing at the scale.
There are still random checks of weight to make sure you do not use pre pass as a way to run over weight.

One of the scales I pass almost daily has pre pass but it is of no good because they have also installed a weigh in motion scale in the road that weighs your truck at 70 mph; and then gives you a OK to pass the scale on a road sign. So pre pass or not a lot of trucks get to bypass this scale.

Cool.

jb

This is where the pre pass does me some good. I can side step the motion scale by running the white line. The computer picks it up as the left wheel weighing more than the right wheel so it is a automatic pull in. BUT it does not register as a over weight condition because it only weighed 1/2 the truck. The left side. So the pre pass gives you a green light. Pre pass over rides the sign on the side of the road that tells you to pull in so you can bypass.

I may have to kill you now that I have filled you in on trade secrets.

I know nothing! I see nothing!