I just wanted to chime in and say while
@TheUndeadPhoenix is correct, IMO the chances of the cops stopping you are medium to high, even if you're not doing anything wrong. Cops know that hitchhikers are more likely than other people to have a warrant they can bust you on.
This is why it's a terrible idea to hitchhike if you have outstanding warrants or if you're a runaway, etc.
Now, not having an ID isn't a crime (yet), so you can always lie and there's nothing they can really do about it unless they take you in and make you give your fingerprints, in which case you're being booked on something already and you're already screwed.
So, if you don't have any warrants, I wouldn't worry about it. Just give them whatever info you want (even your real info if you don't care that much) and be polite and non-threatening, and you'll be fine. They'll just give you back your ID and tell you to stay safe or chase you off, in which case you can just go find another onramp.
on a side note, please try a little harder to post in the correct category next time. this isn't a travel story, and you put no effort into your title.
READ THE GUIDE TO STP WE SENT YOU, FOR GOD SAKES. IM GOING TO START STRAIGHT LOSING MY SHIT WHEN PEOPLE DONT TAKING THE TIME TO READ IT, WE SENT IT TO YOU IN PM AND IN EMAIL, READ THE FUCKING THING. JESUS.
thread moved to the hitchiking section.