56. Vehicles carrying dangerous items or loads that are extra long, extra wide, extra tall, or extra heavy are prohibited from traveling in long tunnels. (A)O(B)X

53. Before entering lanes or changing lanes, drivers should flash their turn signal to signal their direction, check for vehicles in their rear view mirror and look over their left and right shoulders to check the movement of vehicles in the adjacent lanes in order to eliminate the blind spots not shown in the rear view mirror. (A)O(B)X