You all must have known that I would bash this yuppie scum. I like ho you have evolved from a wannabe hitchhiker to a bonafied rubber tramp in 2 post responses. If I had a drivers license I would seriously consider being a part time rubber tramp. We tend to give ourselves the answers. Just as you knew that your impatient question here would receive shit.
And I don't want any shit just answer the fuckn ?'s
Please use the search button and try to research the hundreds/thousands that have contributed on all of these new traveler type questions. You will certainly have many basic questions:

: that we all get very tired of answering, dont post them all without first doing your due diligence with research. Or we will surely let you know.::rules::
My rules are If you are behind the sign you are not out of line. Meaning that I hitch at the beginning of on ramps, ideally on a sidewalk. If I get waived off by the police I move it along & readjust my location. Some times they will run your id & question you, I play dumb & point to the sign & say that I was behind the sign; they usually say that you cant be on the ramp at all. I say sorry, part ways & walk back to a lesser vantage point & try again. They willmost likely come by to check on you periodically over the next few hours. Often times they will give you a ride elsewhere to get you out of their hair so they dont have to issue you a loitering ticket. Most times this involves walking instead. Now you cant usually walk along the highway but a good trick is if you are walking but not soliciting(no sign/no thumb) you can say that you were ejected by a driver on the middle of the highway. You dont deny that you were hitchhiking at the time that you got picked up but while walking you were trying to get to the next safe exit. They will drop you somewhere legal for pedestrians & warn you not to be hitching on the interstate. Dont let them scare you into not hitching just know your legal rights. Some places its illegal like Wisconsin & I think NJ, near prisons etc but fuck it you gotta just keep moving either on foot & or take the risk hitching.
Truck stops are usually your island oasis but dont press your luck. Different places have different rules & it best to be as invisible as you can for as long as you can. I usually beg a locl trucker for a shower credit once I get there. I hen shower, do laundry, charge my phone & eat if I have cash. Then once the basic needs are taken care of I will fly a sign in a direction or to a destination but be posted up near the entrance but off to the side to not harass customers & ideally be out of view from the staff & manager. If I get run off of there I will usually walk out onto he on ramp area & start hitching in earnest or go across the street since most truck stops have competitor truck stops less than a mile away usually in a direct line of sight.
Rest areas are a bit harder at times since they are often patrolled by state police or staffed with some rent a cop. Some places are cool & unmanned & you can stay there for days out of the elements in the lobby/bathroom while charging your device, spanging up coins for he vending machine or trying to get a ride out. Since they are usually located on the highway without an access road you are on an island that doesnt allow walking off of the property yet leo will often tell you to leave & that you can solicit in or near the rest area. Prepared to have your id ran & your gear searched.
I usually only camp where i have all of these, access to electricty to charge my phone, working plumbing with running water or at the least a porta pottie, cover & concealment from the weather & being spotted by leo. 99% of the time I can find a suitable spot with 3 out of 4 of these. I have also just crashed on the side of the road due to exhaustion & had to find all of the infrastructure anyway to take a shit, get some food, clean up etc.