Follow the crowd and read the signs. Some will keep the green light lite and let you just (slowly) run thru. others will have you stop and wait for the green; then others will do one axle at a time until your clear. Pretty straight forward and easy, unless something is wrong and have to rescale after moving some weight around or have to get inspected.
Pull in follow the lite and/or arrows.Most just wanna check your permits.So before entering especially the west coast make sure your permits haven't expired and make sure you have a permit for the state you go thru.
Do you need to stop at the ones in the middle of the state if you already stopped at one when you entered the state?
Go through just like you would any other weigh station. Just be sure to watch the signs that say whether or not to come in. Be sure you bring your book that has your IFTA license and truck registration. Likely will be all you need.
Look for the big white sign. If you don't see one then carry on even if you see a green sign saying port of entry. If in doubt go ahead and stop. For example, heading West on I-90 you will come to a port of entry at exit 189 in Sundance. Heading west there is a big white sign so you must stop. Heading East there is no big white sign so drive on. Now continuing west there is another port of entry at exit 128 in Gillette. You don't have to stop there either direction. It is just for side roads like Hwy. 59 and 50. Keep going west and you will come to a port of entry just past Sheridan at exit 16. You will have to stop there both east and west as it is a joint pole with Montana. So basically stop if you see a big white sign saying you must stop. Otherwise roll on through.
Technically yes you have to stop at all of them unless they clear you on the road or are closed. Most states have the scale houses linked, so once you pass (and clear) the first one, you usually won't have to worry about the rest of them. But just because you clear one doesn't mean that you will clear the others. Meaning that they can scale if they want to/feel a need to...
Does Wyoming still have that sign saying that the POE is open 365 days a year? I remember that sign coming in from Utah