If you use the LaneOutsideSuper subassembly you can set the parameter of only one of the lanes to have a crown point on inside edge of the lane.
Seems the basic lane doesn't have that option. Perhaps you can change the subassembly to LaneOutsideSuper and set the parameters.
Cliff Patterson
Rocke & Associates
Fort Wayne, IN.
Civil 3d 2007, SP-3
Xeon 2.80 Ghz, 2.0 GB Ram