Driving, driving ... It requires reset from time to time. Rest areas are a lovely place to meet new people and share some fun. Some are more suited tha others and you should defini6avoid the summer for this type of place as there are many families.
What you want is a quiet area where you can enjoy your partner or some strangers. It can be on the grass, on a table, against a tree ... Or any other funny and challenging idea you many have.
Keep ini do that, at least in Europe, cops drive through these places to ensure everyone is safe ...
As you can read in my book (in the store here) I had some wild adventures in such places ...