Yes, the Transfer Station is further from the crime scene than RL's house. But prior to the revelation that he'd driven to the transfer station, it was assumed he was walking. Since the road on which the transfer station is located also passes under the bridge, and since we know now RL was driving when he chose to do so, it would have been possible for him to have driven almost to the exact scene of the initial abduction. Some have theorized that the perp, in taking the girls "down the hill" from the south end of the bridge, led them to a waiting vehicle. None of this proves anything about RL, only that he had the means to be under the bridge without walking there or to have dropped off someone under the bridge.
Personally, I think it's unlikely the girls were taken anywhere by vehicle because taking them back at night would have been highly risky--LE could easily have been there with night-vision capability, for example.