To clarify - if you want to ride from Quartzsite to Morgantown, on the north side of hwy 10, you’ll need permits to go west of the ride line. I saw no signs on the south side of hwy 10 anywhere, including west of hwy 95. I also rode what I believe is called the Good, Bad and Ugly section of the AZPT, both directions and saw no signs there either.
If you ride that section going east to west, pay attention - it looks like the trail stays in the creek bed but there’s a bypass going straight across the creek and up the far bank. You’ll know if you see a tree branch lying in the creek bed as you try to turn left, go straight across and up the bank. There are two routes that stay in the creek and they’re both really ugly IMO (Walked and looked before I saw the trail going up the bank). Going up stream (west to east) is more clear and hard to miss the bypass. Some have stayed in the creek and left broken parts to prove it.