Let's say you're traveling west on I-8 out of Yuma (like I was this morning) and you want to head to the various free dispersed camping areas along Ogilby Road (like I did this morning). Well, there's a slight problem with that. The never-ending rebuilding of I-8 means the westbound Ogilby Road off ramp is closed until spring. At least.
All is not lost. Continue two miles to the Grays Wells exit, or to that weird rest stop in the middle of the highway a little farther along, and loop back to the eastbound Ogilby Road exit.
But watch out for the California Highway Patrol guy lurking on the shoulder, hoping to catch people speeding in the construction zone.