All signs, whether fixed or temporary, visual or audible, must be adhered to at all times. These indication signs must be observed at all times. This is sometimes by means of a standard red or green traffic light and sometimes by means of a green arrow or red cross. Some tunnels have indicators above the carriageway which shows if the lane is open or closed. There may be other signs on the entry to tunnels such as the R-306 which prohibits heavy goods vehicles over 3,500 kg from overtaking. The speed limit in tunnels is controlled with the R-301 mandatory maximum speed limit sign (a red circle with the speed limit in the centre), although many also have an advisory maximum speed limit, indicated by the S-7 blue square with white numbers.īefore entering the tunnel we will also see the R-413 sign, a blue circle with a headlight pictogram in the centre, telling us that it is mandatory for us to use headlights at all times. When approaching most tunnels a blue rectangular sign provides some key information about the tunnel, such as the name and the length, as well as details about emergency help points within. Traffic laws must be strictly adhered to in tunnels or underpasses on account of the increased risk factors involved in this type of road route, with attention specifically to such matters as using headlights, observing speed and safe distance requirements and not stopping, parking, changing direction or reversing.
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