A signal used in tunnel areas, control areas and on trunk roads/expressways to show whether a driver may continue in a lane or what action must be taken.
設於隧道區、管制區及主幹路／快速公路的燈號，用以指示駕駛人可否繼續使用某條行車線或須採取甚麼行動。
A signal used in tunnel areas, control areas and on trunk roads/expressways to show whether a driver may continue in a lane or what action must be taken.
設於隧道區、管制區及主幹路／快速公路的燈號，用以指示駕駛人可否繼續使用某條行車線或須採取甚麼行動。