Anyone knows if the subsection of this highway starting from chongqing ends in baidicheng or wushan?

Hi, to Wushan, you can take a direct bus at the local bus station.
To Baidicheng, the subsection of expressway should pass Fengjie. Actually, to reach there by bus, you need to take a bus to Fengjie and then tranfer to another bus there.

Buses to Fengjie can be taken at the local Wanzhou Passenger Transport Center or Longtousi Bus Station. They are scheduled from 06:40 to 18:50 every day.