On motorways and dual carriageways, is making a U-turn prohibited?

Making a U-turn is prohibited in any situation where it is not possible to verify that we will not endanger or obstruct other road users, such as on bends and crests with reduced visibility, or in the case of fog or heavy rain. U-turns are also prohibited at: - Level crossings (not prohibited in their vicinity). - Tunnels, underpasses, and road sections affected by the "Tunnel" sign. - Motorways and dual carriageways, except in places designated for this purpose. (Photo 1) - On one-way carriageways and road sections. - On all road sections where overtaking is prohibited, unless the U-turn is expressly authorised.