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Slippery Road Ahead – W333 Road Sign

The W333 Slippery Road Ahead road sign is a South African warning sign used to alert drivers and other road users that an unusually slippery section of roadway is ahead.

The official South African road traffic sign designation is W333 SLIPPERY ROAD. The sign is intended for situations where the road surface may be sufficiently slippery that drivers need to make a considerable reduction in speed.

W333 gives approaching road users advance warning of the hazardous surface condition so they can adjust their driving before reaching the affected section.

What Does the W333 Road Sign Mean?

W333 means that a slippery section of roadway is ahead. It warns road users of abnormally slippery conditions that require a considerable reduction in speed.

The warning can be relevant where the road surface becomes unusually slippery because of factors such as wet conditions, surface treatment, loose material, contamination or other conditions that affect tyre grip.

W333 is a warning sign. It does not itself impose a specific legal speed limit.

Why Is the W333 Slippery Road Sign Important?

Reduced tyre grip can affect how a vehicle responds to steering and braking.

When a road becomes unusually slippery, drivers may need more time and distance to control the vehicle, particularly if they approach the affected area at excessive speed.

W333 provides advance information so drivers can prepare for the road condition and reduce speed before reaching the slippery section.

When Is W333 Used?

The SARTSM states that W333 is used to warn road users about abnormally slippery conditions on the roadway ahead for which a considerable reduction in speed is necessary.

This means W333 is intended for a meaningful slippery-road hazard rather than ordinary wet-road conditions that occur during normal rainfall.

What Can Cause a Slippery Road?

A road can become unusually slippery for a variety of reasons, depending on the location and surface condition.

Possible causes include:

• Water on the roadway
• Oil or fuel contamination
• Loose material on the surface
• Dust or other surface contamination
• Fresh road surfacing
• Loose stone chippings after roadworks
• Surface treatments
• Other conditions that significantly reduce tyre grip

The actual cause should be assessed before selecting the appropriate warning arrangement.

W333 and Wet Weather

Wet weather can make certain sections of road more slippery than normal.

Where the slippery condition is occasional and occurs during wet weather, the SARTSM states that W333 may be supplemented with a plate carrying the wording “When wet”.

This provides additional information that the slippery condition is particularly relevant when the road surface is wet.

W333 “When Wet” Supplementary Plate

A “When wet” supplementary plate can be useful where a slippery-road condition is not continuously present but becomes hazardous when rainfall wets the roadway.

The message should only be used where it accurately describes the conditions at the location.

Drivers should still adjust their speed to the actual weather, visibility and road-surface conditions.

W333 and Road Surface Contamination

Oil, fuel, dust, loose material and other contaminants can reduce the available grip between tyres and the road surface.

Where contamination produces an abnormally slippery section that requires a considerable reduction in speed, W333 may be appropriate.

Temporary traffic-management measures may also be required when contamination results from an incident or roadworks activity.

W333 and Roadworks

Road construction and maintenance can sometimes create temporarily slippery conditions.

Fresh surfacing, loose stone chippings, dust or other temporary surface conditions can affect tyre grip, particularly when combined with road curvature, crossfall or wet weather.

The SARTSM roadworks guidance specifically identifies TW333 as a possible warning where slippery conditions arise at roadworks sites.

Temporary Slippery Road Sign – TW333

The temporary version of W333 is designated TW333.

TW333 is used when slippery road conditions are temporary, including suitable situations at roadworks sites or where the affected roadway is expected to be repaired within a short period.

The temporary warning allows drivers to be informed about a condition that is not intended to remain permanently.

TW333 for Road Construction and Maintenance

TW333 may be relevant during projects involving:

• Resurfacing
• Road resealing
• New asphalt surfaces
• Surface treatments
• Loose stone chippings
• Temporary pavement conditions
• Other roadworks that create slippery conditions

Temporary signing should be reviewed as the roadworks progress and changed or removed when the temporary hazard no longer applies.

W333 and Resurfacing Work

Recently resealed or resurfaced roads may require additional warning where the surface condition creates a slippery-road hazard.

The SARTSM roadworks guidance notes that TW333 and related signs should be considered where loose stone chippings or dust, combined with significant horizontal curvature or road crossfall/superelevation, can create slippery conditions.

The same guidance indicates that TW333 may be used where the slippery road surface is considered a greater hazard than the risk of loose stone being thrown up by traffic.

W333 and Road Curves

A slippery surface can create additional difficulty when it occurs on a curve because vehicles are already changing direction.

Where road curvature and slippery conditions combine to create a significant hazard, advance warning gives drivers more time to reduce speed before entering the affected section.

W333 and Steep Roads

Slippery conditions on a steep ascent or descent can require additional caution because the vehicle is operating on a gradient as well as a reduced-grip surface.

Where other road hazards are present, additional warning or regulatory signs may be required as part of the overall traffic-management arrangement.

How Should Drivers Respond to W333?

Drivers approaching a W333 sign should prepare for a slippery section of roadway and reduce speed appropriately before reaching the affected area.

Drivers should:

• Reduce speed before entering the slippery section.
• Avoid sudden braking where possible.
• Avoid sudden steering movements.
• Maintain a safe following distance.
• Keep both hands properly positioned for vehicle control.
• Watch for water, oil, loose material and other surface hazards.
• Adjust driving to the actual weather and road conditions.

The appropriate response depends on the actual road, traffic, vehicle and weather conditions.

Does W333 Set a Speed Limit?

No. W333 is a warning sign and does not itself create a regulatory speed limit.

Its purpose is to warn about an abnormally slippery road condition where a considerable reduction in speed is necessary.

Where a legal speed restriction applies, the appropriate regulatory speed-limit sign should be used separately.

W333 and Recommended Speed

Additional speed information may be provided where appropriate to help drivers understand how they should approach the hazard.

A recommended or advisory speed should not be confused with a regulatory speed limit. The former provides guidance, while a regulatory speed-limit sign establishes the applicable legal restriction.

W333 and Distance Plates

Where the slippery section continues for a considerable distance, a supplementary distance-information plate may be used below W333.

The SARTSM also provides for W333 to be repeated at intervals of approximately 2 km where necessary.

This helps maintain driver awareness where the slippery condition continues over a longer section.

W333 Sign Placement

W333 should be located in advance of the beginning of the slippery roadway section.

The SARTSM states that the warning position should be determined in accordance with the applicable requirements of Table 3.1 or Figure 3.1.

The final position should also take account of the operating speed, visibility and characteristics of the particular road.

W333 and Sign Visibility

The sign should be positioned so that approaching drivers can clearly recognise the warning before reaching the slippery section.

Visibility can be affected by:

• Sharp curves
• Road crests
• Dips
• Vegetation
• Buildings
• Other signs
• Advertising structures
• Dust
• Rain or fog

The sign should remain unobstructed, clean and legible.

W333 at Night

Slippery road conditions can be more difficult to identify at night, particularly where road lighting is limited.

Retroreflective warning signage helps provide advance information when illuminated by vehicle headlights.

Drivers should still respond to the actual road conditions rather than relying on the sign alone.

Permanent W333 Sign Design and Colours

The permanent W333 warning sign follows the standard South African warning-sign colour arrangement:

• Triangle: Red retroreflective
• Symbol: Black semi-matt
• Background: White retroreflective

The symbol depicts a vehicle losing traction on the roadway.

Temporary TW333 Sign Design and Colours

The temporary TW333 warning sign uses:

• Triangle: Red retroreflective
• Symbol: Black semi-matt
• Background: Yellow retroreflective

The yellow background identifies the sign as a temporary warning sign.

Retroreflective W333 Road Signs

Retroreflective materials help the sign remain visible when illuminated by approaching vehicle headlights.

The official specification provides for red retroreflective, black semi-matt and white retroreflective elements on the permanent sign, with a yellow retroreflective background for the temporary version.

For public-road applications, W333 signs should be manufactured according to the applicable South African road traffic sign specifications.

W333 Sign Size

The appropriate sign size depends on the road environment and applicable road-sign requirements.

Factors that may influence sign-size selection include:

• Operating speed
• Road classification
• Viewing distance
• Traffic volume
• Roadside environment
• Available installation space

For public roads, the final size should be selected according to the applicable SARTSM requirements and the responsible road authority.

W333 and Motor Vehicle Control

A slippery road can affect traction during braking, acceleration and steering.

Drivers should therefore avoid abrupt actions when approaching the affected section and maintain a speed that is appropriate for the actual conditions.

W333 and Wet Braking

Wet surfaces can affect braking performance because tyre grip may be reduced.

Drivers should allow appropriate following distance and avoid unnecessary sudden braking when approaching a slippery section.

W333 and Motorcycles

Motorcyclists should take particular care when approaching a slippery-road warning because reduced grip can affect motorcycle stability.

Loose material, oil, wet surfaces and other contaminants can be particularly important for two-wheeled road users.

Riders should reduce speed smoothly and remain alert to changes in surface condition.

W333 and Heavy Vehicles

Heavy vehicles should also approach slippery sections carefully.

Vehicle mass, load condition, braking characteristics and road gradient can influence vehicle response.

Heavy-vehicle drivers should reduce speed appropriately and maintain adequate following distance.

W333 and Pedestrians and Cyclists

Although W333 is directed primarily at the slippery roadway hazard, pedestrians and cyclists may also be affected by unusual surface conditions.

Where pedestrian or cyclist hazards are separately present, the appropriate warning signs and road-user facilities should be considered independently.

W333 on Urban Roads

Urban roads can develop slippery sections because of rainfall, surface contamination, construction activity, road treatments or other conditions.

Where the condition is unusually slippery and requires a considerable reduction in speed, W333 can provide advance warning.

W333 on Rural Roads

Rural roads may contain sections where wet weather, loose material, road surfacing or environmental conditions create reduced traction.

Where the slippery condition represents a significant hazard, W333 may be used to give approaching drivers advance warning.

W333 on Mountain and Hilly Roads

Hilly and mountainous roads can require additional caution where slippery surfaces occur together with curves, gradients or limited visibility.

In these situations, the complete traffic-management arrangement should take account of all relevant hazards rather than relying on W333 alone.

W333 on Industrial and Commercial Roads

Industrial and commercial properties may contain areas where oil, fuel, dust, water or other materials affect the road surface.

Where an unusually slippery section creates a traffic-management concern, suitable warning signage can alert drivers and other road users.

W333 on Private Roads and Properties

Similar slippery-road warning signage may also be used on private roads and controlled properties where unusual surface conditions create a hazard.

Potential applications include:

• Factories
• Warehouses
• Distribution centres
• Mining sites
• Farms
• Private estates
• Lodges
• Hotels
• Construction sites
• Commercial properties
• Industrial access roads

On private property, the sign can form part of an internal traffic-management system based on the actual site conditions.

W333 and Construction Sites

Construction sites can create slippery road surfaces through mud, water, dust, loose aggregates, temporary surfacing and other construction activities.

Where the affected roadway creates a significant slippery hazard, suitable temporary warning and traffic-management measures should be considered.

W333 and Fresh Road Surfacing

Newly resurfaced roads may temporarily have surface characteristics that require additional warning or traffic management.

Where the resulting condition creates a slippery-road hazard, TW333 may be considered as part of the roadworks signing arrangement.

W333 and Loose Stone Chippings

Loose stone chippings can affect vehicle movement, particularly when combined with road curvature, dust, wet conditions or significant crossfall.

The South African roadworks guidance specifically identifies TW333 as a sign that may be considered where the combination of these conditions creates slippery-road risk.

W333 and Road Maintenance

Warning signage should not replace the investigation and correction of a road-surface problem where maintenance is required.

If a slippery condition results from contamination, drainage problems, surface deterioration or construction activity, the underlying cause should be addressed where practical.

Who May Need W333 Slippery Road Signs?

W333 signage may be relevant to:

• Road authorities
• Municipalities
• Road maintenance contractors
• Road construction contractors
• Traffic-management contractors
• Property developers
• Industrial facility managers
• Mining operations
• Warehouse operators
• Commercial property managers
• Private estate managers
• Construction site managers

Benefits of W333 Slippery Road Warning Signs

• Warns drivers about an abnormally slippery road section ahead.
• Provides advance information before the affected section.
• Alerts drivers that a considerable reduction in speed may be necessary.
• Can be supplemented with a “When wet” plate for suitable wet-weather conditions.
• Can be supplemented with distance information where appropriate.
• Can be repeated at approximately 2 km intervals where necessary.
• TW333 provides a temporary warning option for suitable roadworks conditions.
• Supports wider road-safety and traffic-management measures.

Frequently Asked Questions About W333 Road Signs

What does W333 mean?

W333 means Slippery Road. It warns road users of an abnormally slippery section ahead where a considerable reduction in speed is necessary.

What is the official name of W333?

The official South African designation is SLIPPERY ROAD.

What is W333 used for?

W333 is used to warn about an unusually slippery roadway where drivers need to significantly reduce speed.

Does W333 warn about wet roads?

It can apply where wet weather creates an unusually slippery condition. Where the condition is occasional and occurs during wet weather, the SARTSM allows a supplementary “When wet” plate.

What does “When wet” mean on a W333 sign?

It indicates that the slippery condition occurs particularly when the road surface is wet.

Does W333 impose a speed limit?

No. W333 is a warning sign and does not itself establish a legal speed limit.

What should drivers do when they see W333?

Drivers should reduce speed appropriately, avoid sudden manoeuvres and remain alert to changing road-surface conditions.

Can W333 be used for oil on the road?

Where contamination creates an abnormally slippery roadway hazard requiring significant speed reduction, W333 may be appropriate.

Can W333 be used after road resurfacing?

Yes, where resurfacing or related roadworks create a slippery condition requiring advance warning, the temporary TW333 arrangement may be appropriate.

What is TW333?

TW333 is the temporary Slippery Road warning sign.

When is TW333 used?

TW333 is used for temporary slippery road conditions, including suitable conditions associated with roadworks.

Can W333 be used during roadworks?

Yes. TW333 may be used where roadworks create temporary slippery conditions.

Can W333 be repeated?

Yes. The SARTSM states that W333 may be repeated at intervals of about 2 km where necessary.

Can W333 have a distance plate?

Yes. A supplementary distance-information plate may be displayed below W333.

How far before the slippery road should W333 be placed?

The sign should be located in advance of the affected section according to the applicable Table 3.1 or Figure 3.1 requirements, taking account of operating speed and site conditions.

What colours does a permanent W333 sign use?

The permanent sign uses a red retroreflective triangle, black semi-matt symbol and white retroreflective background.

What colours does TW333 use?

The temporary version uses a red retroreflective triangle, black semi-matt symbol and yellow retroreflective background.

What does the W333 symbol show?

The symbol shows a vehicle losing traction or skidding, representing a slippery roadway condition.

Can W333 be used on a private road?

Similar slippery-road warning signage can be used on private roads and controlled properties as part of an appropriate internal traffic-management arrangement.

Can W333 be used on rural roads?

Yes, where an unusually slippery road condition creates a significant hazard and requires advance warning.

Can W333 be used on industrial property?

Yes. Similar signage may be useful where unusual surface contamination or other conditions create a slippery-road hazard.

Is W333 a warning sign?

Yes. W333 belongs to the W-series warning signs.

Is W333 the same as W331?

No. W331 warns about an uneven or potholed roadway, while W333 warns about an abnormally slippery road condition.

Can W333 be used with other road signs?

Yes. Other warning, regulatory and traffic-management signs may be required depending on the complete road environment.

Is a W333 sign a replacement for road maintenance?

No. The warning sign alerts road users to the hazard, while the underlying road condition should be investigated and addressed where maintenance or repair is required.

Can Signs4SA supply W333 signs?

Yes. Signs4SA can assist with W333 Slippery Road signs, temporary TW333 signs, supplementary “When wet” plates, distance plates and other road traffic signage.

Order W333 Slippery Road Warning Signs

Need W333 Slippery Road signs for a road maintenance project, resurfacing project, construction site, industrial facility, rural road, private estate or traffic-management application?

Signs4SA can assist with the supply of permanent and temporary slippery-road warning signs for different applications.

Contact Signs4SA with the W333 or TW333 code, required quantity, sign size, material and installation requirements to request a quotation.

Slippery road ahead signs come in a variety of styles and formats, including danger signs, warning signs, and caution signs. Danger signs are used to indicate an immediate threat that could cause serious injury or death, such as high voltage areas or hazardous materials. Warning signs are used to indicate potential hazards that could cause injury, such as slippery floors or falling objects. Caution signs are used to indicate potential hazards that could cause minor injury, such as low ceilings or uneven surfaces. Another type of safety sign is the Slippery road ahead sign, which is used to provide guidance on safe behavior. These signs can include instructions on how to use equipment or machinery safely, as well as reminders to wear personal protective equipment (PPE) or follow specific safety protocols. Slippery road ahead signs can also be used to ensure compliance with safety regulations. For example, fire safety signs are required by law in most public buildings and workplaces. These signs indicate the location of fire exits, fire extinguishers, and other fire safety equipment.

More About Slippery road ahead

Safety signs are an essential part of any workplace or public space. They are used to warn people of potential hazards, provide guidance on safe behavior, and ensure compliance with safety regulations. One type of safety sign is the Slippery road ahead sign, which is designed to alert people to potential dangers in a particular area. Slippery road ahead signs come in a variety of styles and formats, including danger signs, warning signs, and caution signs. Danger signs are used to indicate an immediate threat that could cause serious injury or death, such as high voltage areas or hazardous materials. Warning signs are used to indicate potential hazards that could cause injury, such as slippery floors or falling objects. Caution signs are used to indicate potential hazards that could cause minor injury, such as low ceilings or uneven surfaces. Another type of safety sign is the Slippery road ahead sign, which is used to provide guidance on safe behavior. These signs can include instructions on how to use equipment or machinery safely, as well as reminders to wear personal protective equipment (PPE) or follow specific safety protocols. Slippery road ahead signs can also be used to ensure compliance with safety regulations. For example, fire safety signs are required by law in most public buildings and workplaces. These signs indicate the location of fire exits, fire extinguishers, and other fire safety equipment. In addition to these types of safety signs, there are also specialized signs available for specific industries or hazards. For example, construction sites may use signs to indicate the location of underground utilities or to warn of falling debris. Healthcare facilities may use signs to remind employees to wash their hands or to indicate the location of first aid supplies. When selecting safety signs, it is important to choose signs that are appropriate for the specific hazard or situation. Signs should be placed in prominent locations where they are easily visible, and should be made from durable materials that can withstand harsh environmental conditions. By using safety signs effectively, businesses and organizations can help protect their employees, customers, and visitors from harm.

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