820.In a tunnel 4 km or longer or one announced by the management authority, when traffic slows below 20km/h or stops due to congestion or an accident, vehicles should still maintain at least:
(A) 20 meters.
(B)30 meters.
(C) 50 meters.

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#7521129
考試重點觀念 本題屬於 隧道行車安全距離...
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