Circulando en un túnel, ¿qué distancia de seguridad debemos mantener con el vehículo que nos precede?

In tunnels and underpasses, when not intending to overtake, you must at all times keep a safe distance of at least 100 metres or a minimum time gap of four seconds from the vehicle in front. For vehicles with a maximum authorised mass (MAM) over 3,500 kg, the safe distance must be at least 150 metres or a minimum gap of 6 seconds. Remember that overtaking is prohibited in tunnels unless there is more than one lane in our direction. The sign shown reminds us of the general safe distance we must keep.