The two-lane Going-to-the-Sun Road is quite narrow and winding, with hairpin turns, especially west of Logan Pass. Consequently, vehicle lengths over the highest portions of the roadway are limited to no longer than and no wider than between Avalanche Creek and Rising Sun picnic areas which are located many miles below Logan Pass, on the west and east sides of the pass, respectively. Vehicles over in height may not have sufficient clearance due to rock overhangs when driving west between Logan Pass and the hairpin turn called the Loop.