Minimum speeds in town and outside town

Article 49. Minimum speeds in town and outside town.
1. The normal progress of other vehicles must not be obstructed by travelling at abnormally reduced speeds without justified cause. Therefore, driving on autopistas and autovías is prohibited at a speed less than 60 kph, and on other roads, at a speed less than half of the maximum limit for each category of vehicle in this chapter, whether or not in the presence of other vehicles.
2. Vehicles may drive at below the minimum speed limit if special vehicles and vehicles in the special transport regime or when traffic, the vehicle or the road prevent driving at a speed over the minimum without hazarding traffic, as well as where protecting or supporting other vehicles to whose speed the accompanying vehicle must adapt. In these cases the support vehicles must display signals V-21 or V-22, appropriate to Article 173.
3. If a vehicle cannot reach the required minimum speed and danger of collision exists, the hazard lights must be used whilst driving.
4. Infractions of this Article are serious offences, (LST Art 65.4.c).