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Another option towards Leshan and Ya'an is getting to the Shangliu Tollgate. Take subway number 1 (2-5 yuan) to its terminal station, Guangdu (don't you love terminal stations?). Get out at exit A, turn left and walk until the really big avenue (Tianfu Ave.), cross it and immediately turn left (still on Tianfu, just on the other side). Walk a couple hundred meters to 4th Huayang Ave, on which you'll find the 828 bus stop (1 yuan). It basically goes in a straight line all the way to the toll gate, the ride there takes about half an hour. Keep your eyes open for the Gao Su above you, and it's time to get off. You can hitch before the toll gate or in the gas station right next to it. The highways to Leshan and Ya'an/Yunnan split a few KMs south of here.

If you are going south (towards Yunnan) or west (towards Kangding and Litang), you can also get a bus to Pujiang from the Xinnanmen Bus Station located in the city center. Tickets are 27RMB (approx. $4.50). The bus station in Pujiang is a 5 minute walk to the highway where you should be able to find a ride.