Prohibition road signs are regulatory traffic signs used to communicate actions, movements, access or vehicle conditions that are not permitted in a particular area. They help road users understand restrictions and support the safe management of traffic.

Prohibition signs can be used on public roads, highways, private roads, industrial sites, commercial properties, parking areas, construction projects and other locations where specific traffic restrictions apply.

In South Africa, Prohibition signs form part of the regulatory road traffic sign system covered by the SADC Road Traffic Signs Manual and South African road traffic sign requirements. The appropriate sign, design, placement and application depend on the specific road environment and applicable requirements.

What Are Prohibition Road Signs?

Prohibition road signs communicate that a particular action, movement, vehicle type or access condition is not permitted.

These signs allow restrictions to be communicated visually using standardised road-sign shapes, colours and symbols. This makes the restriction easier for road users to recognise while travelling.

What Do Prohibition Road Signs Look Like?

Prohibition signs are generally circular regulatory signs. The standard design uses a white background, a red border and a black symbol or message, depending on the particular sign.

The exact appearance of a prohibition sign depends on the specific restriction being communicated and the applicable road traffic sign specification.

Why Are Prohibition Road Signs Important?

Prohibition signs make traffic restrictions clear to road users. They can help control access, restrict particular vehicle types and prevent movements that are not suitable for a specific road or area.

• Communicate traffic restrictions clearly
• Restrict specific vehicle types where required
• Control access to designated areas
• Help manage traffic movement
• Reduce confusion about road restrictions
• Support compliance with applicable traffic requirements

What Types of Prohibition Road Signs Are Available?

Prohibition road signs cover a wide range of vehicle, road-user and movement restrictions. The correct sign should be selected according to the specific restriction that needs to be communicated.

Length Limit Road Signs

Length restriction signs communicate a maximum vehicle length applicable to the particular road or area. They can be used where longer vehicles need to be restricted because of road layout, infrastructure or other conditions.

Mass Limit Road Signs

Mass limit signs communicate a restriction relating to the permitted mass of vehicles using a particular road or area. These restrictions can be important where infrastructure or road conditions require limits on vehicle mass.

No Abnormal Vehicles Road Signs

These signs communicate that abnormal vehicles are not permitted in the applicable area. Restrictions may be relevant where oversized or unusual vehicle dimensions could create access or safety problems.

No Agricultural Vehicles Road Signs

No Agricultural Vehicles signs restrict agricultural vehicles from using the applicable road or area where such a restriction is required.

No Animal-Drawn Vehicles Road Signs

These signs communicate that animal-drawn vehicles are not permitted on the applicable road or route.

No Buses Road Signs

No Buses signs communicate that buses are prohibited from using a particular road, route or area where the restriction applies.

No Construction Vehicles Road Signs

No Construction Vehicles signs restrict construction vehicles from entering or using an area where such vehicles are not permitted.

No Cyclists and Pedestrians Road Signs

These signs communicate that both cyclists and pedestrians are prohibited from entering or using the applicable road or area.

No Cyclists Road Signs

No Cyclists signs communicate that cyclists are not permitted to use the particular road, lane or area where the sign applies.

No Delivery Vehicles Road Signs

No Delivery Vehicles signs can be used to restrict delivery vehicles from entering or using designated areas where delivery access is not permitted.

Other Common Prohibition Road Signs

Prohibition signage can cover many other restrictions depending on the road environment and applicable traffic requirements.

Examples can include restrictions relating to vehicle types, turning movements, overtaking, parking, entry, pedestrian access and other prohibited activities.

The correct standard sign should be selected according to the exact restriction being applied.

Prohibition Road Signs for Public Roads

Public roads may require prohibition signs to control specific traffic movements or restrict particular vehicle categories. These signs are normally selected and installed according to the applicable road traffic sign system and requirements of the responsible road authority.

Sign design, dimensions, placement and mounting are important because road users need to recognise the restriction clearly and in sufficient time.

Prohibition Road Signs for Private Roads

Private roads, residential estates, business parks, industrial properties and commercial developments may also use signs to restrict certain vehicles, movements or access.

Private-property restrictions should be clearly communicated and should take the site's traffic layout, access arrangements and applicable requirements into account.

Prohibition Signs for Parking Areas

Parking areas may require signs to communicate restrictions such as no entry, no parking, restricted vehicle access or designated areas for particular users.

Clear signage can help drivers understand which areas they may use and which areas are subject to restrictions.

Prohibition Signs for Construction Sites

Construction sites often have areas where certain vehicles, pedestrians or activities need to be restricted. Prohibition signs can be used together with warning, mandatory and general construction signage.

Examples may include restricted vehicle access, no unauthorised entry and other site-specific restrictions.

See our construction signs for additional construction-site signage options.

Prohibition Signs for Industrial Sites

Industrial facilities can have heavy vehicles, machinery, loading areas and controlled-access zones. Prohibition signage can help identify areas where particular vehicles or road users are not permitted.

Depending on the site, prohibition signs can be used alongside warning safety signs, mandatory safety signs and general information signage.

Prohibition Road Signs vs Command Road Signs

Both Prohibition and Command signs are regulatory signs, but they communicate different instructions.

• Prohibition signs: communicate an action, movement, vehicle condition or access condition that is not permitted.
• Command signs: communicate a mandatory action or movement that road users are required to follow.

Understanding the difference is important when selecting the correct regulatory road sign for a particular application.

Prohibition Road Signs vs Warning Road Signs

Warning signs and Prohibition signs have different purposes.

Warning road signs alert road users to potential hazards or changes in road conditions ahead.

Prohibition road signs communicate restrictions on actions, movements, access or vehicle types.

For example, a warning sign may alert a driver to a bend ahead, while a prohibition sign may communicate that a particular vehicle type is not permitted on the road.

Are Prohibition Road Signs Legally Enforceable?

Prohibition signs are part of the regulatory road traffic sign system and have legal significance when used as prescribed under applicable road traffic legislation, regulations and traffic-sign requirements.

The exact legal application depends on the particular sign, location and applicable authority or legislation. For public-road applications, the relevant road authority and current traffic-sign requirements should be confirmed.

How Are Prohibition Road Signs Manufactured?

Prohibition road signs can be manufactured using durable sign substrates and finishes selected for the intended environment. Outdoor signs may require materials suitable for exposure to sunlight, rain, wind and other environmental conditions.

Reflective sheeting can also be used where night-time or low-light visibility is required.

Are Prohibition Road Signs Reflective?

Reflective materials can be used for road traffic signs where improved visibility during darkness or low-light conditions is required. The appropriate reflective specification depends on the sign and its application.

Where Should Prohibition Road Signs Be Installed?

Prohibition signs should be positioned where road users can clearly see and understand the restriction before reaching the point where the restriction applies.

Factors such as road speed, visibility, traffic flow, road layout, sign size, mounting position and the nature of the restriction can influence the appropriate placement.

Prohibition Road Signs in South Africa

South Africa's road traffic sign system is supported by the South African Road Traffic Signs Manual and the SADC Road Traffic Signs Manual. These resources provide guidance and specifications for the classification, design and application of road traffic signs.

The exact requirements for a particular sign depend on the application, road authority, road classification and applicable legislation or regulations.

Custom Prohibition Signs

Standard regulatory road signs should use the appropriate standard design so that road users can recognise their meaning consistently.

For private properties, industrial sites, commercial premises and other controlled areas, custom restriction and information signs can also be produced where a standard road traffic sign is not required.

What Materials Are Used for Prohibition Road Signs?

Material selection depends on whether the sign is required for a permanent or temporary application and whether it will be installed indoors or outdoors.

Options may include aluminium and other suitable sign substrates, with reflective finishes where required for the application.

How Much Do Prohibition Road Signs Cost?

The cost of a prohibition road sign depends on the sign type, size, material, reflective requirements, quantity, mounting system and installation requirements.

Larger projects may require multiple signs, poles, brackets and installation, which can affect the overall project cost.

Contact Signs4SA with the required sign type, dimensions, quantity and installation location for a quotation.

Frequently Asked Questions About Prohibition Road Signs

What are prohibition road signs?

Prohibition road signs are regulatory signs that communicate actions, movements, vehicle conditions or access restrictions that are not permitted in a particular area.

What colour are prohibition road signs?

Prohibition signs are generally circular regulatory signs using a white background, red border and black symbol or message, depending on the specific sign.

What are common prohibition road signs?

Common examples include Length Limit, Mass Limit, No Abnormal Vehicles, No Agricultural Vehicles, No Animal-Drawn Vehicles, No Buses, No Construction Vehicles, No Cyclists and No Delivery Vehicles signs.

Can prohibition signs restrict specific vehicle types?

Yes. Regulatory prohibition signs can communicate restrictions relating to particular vehicle categories where the applicable sign and traffic requirement provide for that restriction.

Can prohibition road signs be used on private roads?

Yes. Traffic restriction signage can be used on private roads, estates, industrial properties, business parks and other controlled areas where appropriate.

Are prohibition signs the same as warning signs?

No. Warning signs alert road users to potential hazards or changing road conditions, while prohibition signs communicate restrictions on actions, movements, access or vehicle types.

Are prohibition signs the same as command signs?

No. Both are regulatory categories, but Command signs communicate mandatory actions while Prohibition signs communicate actions or conditions that are not permitted.

Can prohibition road signs be made for outdoor use?

Yes. Outdoor prohibition signs can be manufactured using materials and finishes selected for exposure to weather and the expected service conditions.

Can Signs4SA supply prohibition road signs?

Yes. Signs4SA can assist with prohibition road signs and related regulatory, warning, mandatory and construction signage for roads, commercial properties, industrial sites and private developments.

Order Prohibition Road Signs from Signs4SA

Need prohibition road signs for a public-road project, private road, construction site, industrial property or commercial development?

Signs4SA can assist with prohibition signs, regulatory traffic signs and other road safety signage. Contact us with your required sign type, size, quantity and installation details for a quotation.