The C4f road sign, officially 'Trânsito proibido a veículos de duas rodas', is a prohibitory traffic sign used in Portugal. It clearly indicates that all vehicles with two wheels, such as motorcycles and mopeds, are forbidden from entering or using the road ahead. As a driver, if you encounter this sign, you must understand that your two-wheeled vehicle is not permitted past this point, and you need to find a lawful alternative route.
This prohibitory sign, C4f, strictly forbids entry to two-wheeled vehicles, crucial knowledge for your Portuguese theory test revision. Master its specific road sign meaning and interpretation to ensure safe and legal driving, especially in urban and rural traffic scenarios across Portugal.
C4f - Trânsito proibido a veículos de duas rodas (Trânsito proibido a veículos de duas rodas) belongs to the Portuguese prohibitory signs category in the Regulamento de Sinalização do Trânsito. It normally uses the red-bordered regulatory style associated with restrictions, limits, bans, or cancellation of a previous restriction. The official wording is: trânsito proibido a veículos de duas rodas: indicação de acesso interdito a todos os veículos com duas rodas. It creates a binding restriction from the point where it applies and normally continues until it is ended, replaced, or limited. For theory preparation, connect the sign to a concrete driving decision: where to look, when to slow, whether to stop or yield, which route or lane to choose, and whether any panel changes the scope of the rule. On the road, interpret it together with markings, traffic lights, police directions, temporary works signs, and any additional panel placed with it. A strong exam answer explains both recognition and behaviour: not only what the sign is called, but what a safe and lawful driver must do next.
C4f - Trânsito proibido a veículos de duas rodas (Trânsito proibido a veículos de duas rodas) means that the driver must understand and apply this official Portuguese instruction: trânsito proibido a veículos de duas rodas: indicação de acesso interdito a todos os veículos com duas rodas. In practical terms, you should not enter or use the road with the vehicle or road-user category covered by the prohibition, and choose a lawful alternative route.
Get clear, practical answers to the most common questions about the C4f - C4f - Trânsito proibido a veículos de duas rodas (Trânsito proibido a veículos de duas rodas) road sign. Learn how the sign works, what rules it represents, and how it affects real driving situations. This FAQ strengthens your understanding and supports accurate decision making for the Portuguese driving theory exam in Portugal.
The C4f road sign means 'No Entry for Two-Wheeled Vehicles'. This Portuguese prohibitory sign forbids all vehicles with two wheels, including motorcycles and mopeds, from proceeding onto the road where the sign is displayed. You must not enter this section of road with such a vehicle.
The primary prohibited action is entering or using the road with any vehicle that has two wheels. This includes specific maneuvers like movement, entry, parking, stopping, or overtaking if you are on a motorcycle or moped. You should not continue on this route with a two-wheeled vehicle.
If you are riding a motorcycle or moped, you must not proceed past the C4f sign. Your allowed action is to find a different, lawful route that permits your vehicle type. Always look for alternative directions or roads that allow two-wheeled vehicles.
The C4f sign generally applies to all two-wheeled vehicles. However, always check for any additional panels placed with the sign, as these might specify exceptions, such as limiting the prohibition to certain times or specific types of two-wheeled vehicles. If no additional panel is present, assume the prohibition is absolute for all two-wheeled vehicles.
In the theory test, you may be asked to identify the C4f sign and describe the correct action. Common exam traps include not understanding the specific vehicle types prohibited or failing to identify the need for an alternative route. Recognizing its prohibitory nature and knowing you must not enter is key to a correct answer.
A clear reference image of the C4f - C4f - Trânsito proibido a veículos de duas rodas (Trânsito proibido a veículos de duas rodas) road sign used in Portugal.

The C4f - C4f - Trânsito proibido a veículos de duas rodas (Trânsito proibido a veículos de duas rodas) road sign may also be known by these alternative names or terms.
The C4f - C4f - Trânsito proibido a veículos de duas rodas (Trânsito proibido a veículos de duas rodas) road sign is part of the Prohibitory Signs category, which groups together signs with similar rules and functions.
Understanding distinctions between similar road signs is key to accurate recognition and fewer errors during your theory test revision. Compare these related traffic signs to master sign recognition and improve your driving knowledge for the Portuguese exam.

Understand the C1 'Sentido Proibido' (No Entry) Road Sign

C10: Maintain Minimum Distance from Vehicle Ahead

No Right Turn Ahead: Understanding Portugal's C11a Prohibition Sign

Understand the C11b 'No Left Turn' Road Sign in Portugal

C12 Sign: No U-Turns Allowed Ahead

Obey the Maximum Speed Limit Indicated by the C13 Sign

The C14a 'No Overtaking' Sign Means You Must Not Overtake Most Vehicles
Learn the C14b Road Sign: No Overtaking for Heavy Vehicles
After reviewing the full list, explore signs by specific categories such as warning, regulatory, or informational to deepen your understanding. Practise recognizing signs in context and prepare effectively for your Portuguese driving licence theory test.
All Portuguese Road Signs List