55. Long tunnel is an extremely enclosed underground space. If a fire occurs, temperature in the tunnel may rise as high as 1,000℃ and cause a disaster if drivers do not follow regulations or evacuation procedures in the tunnel. (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

55. Long tunnel is an extremely enclosed underground space. If a fire occurs, temperature in the tunnel may rise as high as 1,000℃ and cause a disaster if drivers do not follow regulations or evacuation procedures in the tunnel.
(A)O
(B)X

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