90% of the time when I go by an open scale, the thing on the windshield beeps & there's a green light flashing & what I do next is grab the hammer lane so I don't have to slow down for the trucks merging back in after the scale.
10% of the time, usually in Virginia, I get the red light, and that means the same as not having it at all.
If the sign says "open" and the pre-pass doesn't do anything at all, which is what happens 100% of the time at the POE at SD/MN state line on I-90, I just pull in there, hit the high-speed scales & get the bypass arrow & get back on the highway.
When I'm in Oregon, 100% of the time, if a scale is open, I get the red light & have to come to a full stop on the scale while the guy in the window appears to be trying to mimic the "thinker" statue, debating whether or not to turn on the sign that says "bring in papers & vaseline". So the last couple of times I went into Oregon, I've pulled the damn thing off the windshield & put it in the fridge or my tool box & when I go by a scale that's open, I get sent down the bypass lane. Oregon DOT doesn't like my company for some reason.