Have a note in Chinese explaining who you are,what you are doing,and that you want to stay on the high way at gas stations or toll boths.
== Sleeping ==
* [http://www.leohostel.com Leo hostel], close to ''Tiananmen'', $6.50 for a dorm.
If you head down the same street west there are two other youth hostels, slightly cheaper even but not so busy. For the closer one turn right at the bifurcation. It is about 5-10min walk from LEO.