Most of the tunnels have one tube with two lanes, but some tunnels have an extra lane when the gradient is more than 6 %.
大多数条海底公路隧道是单洞双线，但是当坡度大于6%时，有些隧道就增加一条线。
Most of the tunnels have one tube with two lanes, but some tunnels have an extra lane when the gradient is more than 6 %.
大多数条海底公路隧道是单洞双线，但是当坡度大于6%时，有些隧道就增加一条线。
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