Revert a change in KeepLane.

options/simple_intersection/maneuvers.py

@@ -24,7 +24,7 @@ class KeepLane(ManeuverBase):
 
     def generate_learning_scenario(self):
         self.generate_scenario(enable_LTL_preconditions=False,
-                               ego_pos_range=(rd.hlanes.near_stop_region, rd.hlanes.end_pos),
+                               ego_pos_range=(rd.hlanes.start_pos, rd.hlanes.end_pos),
                                ego_perturb_lim=(rd.hlanes.width / 4, np.pi / 6),
                                ego_heading_towards_lane_centre=True)
         # the goal reward and termination is led by the SimpleIntersectionEnv