The Tool Desk
Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →It depends where you drive. Hazard-light laws are local, not universal. The UK generally bans using hazard warning lights while a vehicle is moving, except for a narrow motorway or unrestricted-dual-carriageway warning. New South Wales expressly allows them while driving in hazardous conditions such as fog or rain. In the United States, federal guidance discussed by the National Highway Traffic Safety Administration (NHTSA) mainly explains what approaching drivers must do around stopped vehicles; whether you may activate hazards while moving is usually a state-law question.
Identify your country, state or territory before relying on any general answer. The examples below show why the same action can be lawful in one jurisdiction and unlawful in another.
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At a glance: moving, stopped and approaching vehicles
| Jurisdiction or source | Using hazards while moving | Using hazards while stopped | What the rule actually covers |
|---|---|---|---|
| United Kingdom — Highway Code Rule 116 | Generally prohibited. The exception is a motorway or unrestricted dual carriageway when warning drivers behind about a hazard or obstruction ahead. | Permitted when the vehicle is stationary and temporarily obstructing traffic. | The warning must last only long enough for approaching drivers to observe it. The Highway Code identifies regulation 27 of the Road Vehicles Lighting Regulations as the legal basis. |
| New South Wales — NSW Government guidance | Permitted in hazardous conditions such as fog or rain. | Permitted when stopped in a hazardous position, for example while obstructing traffic or pedestrians. | This is a New South Wales rule and should not be treated as a rule for every Australian state or territory. |
| United States — NHTSA overview | Not answered by the federal Move Over guidance. Check the law of the state where you are driving. | Move Over obligations apply when approaching certain stopped vehicles with warning lights. | NHTSA says all 50 states have Move Over laws for emergency vehicles with flashing lights; 19 states and Washington, DC also cover all vehicles displaying flashing or hazard lights. The count can change. |
The key distinction is whether you are (1) travelling with the lights activated, (2) stopped and creating an obstruction, or (3) approaching someone else’s stopped vehicle. Those are different legal questions.
What hazard lights are communicating
Hazard warning lights are the vehicle’s simultaneous flashing indicators. Their purpose is to make other road users notice an unusual danger, obstruction or stopped vehicle. Turning them on does not automatically make every situation legal, and it does not remove the need to comply with separate headlight, fog-light, speed, stopping and parking rules.
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Driving with the lights flashing
This means the vehicle is moving while all indicators flash. Some jurisdictions allow that only in defined circumstances, such as warning following traffic of an obstruction. Others allow it in poor weather. A rule that permits moving use in one place cannot be exported to another.
Stopped and obstructing traffic
A stationary vehicle may be required or allowed to warn approaching traffic when it is temporarily blocking a lane, shoulder, entrance or pedestrian route. The legal trigger is usually the hazard created by the stopped position, not simply the fact that the driver has pulled over.
Approaching a vehicle with warning lights
Move Over rules tell approaching drivers how to pass a stopped emergency, service or other covered vehicle. They are duties imposed on the approaching driver; they are not a blanket authorization for the stopped or moving driver to use hazard lights.
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What Rule 116 says
UK Highway Code Rule 116 states: “You MUST NOT use hazard warning lights while driving or being towed unless you are on a motorway or unrestricted dual carriageway and you need to warn drivers behind you of a hazard or obstruction ahead.” The exception is deliberately narrow. It requires all of the following:
- You are on a motorway or an unrestricted dual carriageway.
- You need to warn drivers behind you.
- The warning concerns a hazard or obstruction ahead.
- You use the lights only long enough for the warning to be observed.
That wording does not create a general permission to drive with hazards on during rain, fog, snow, congestion or nervous driving. It also does not extend the exception to ordinary roads, restricted dual carriageways or every kind of breakdown.
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When a UK vehicle is stationary
Rule 116 allows hazard warning lights when a vehicle is stationary and temporarily obstructing traffic. A broken-down vehicle blocking part of a live lane is the clearest example. Switch them off once the temporary obstruction and warning situation has ended; leaving them flashing simply because the vehicle is parked does not turn an otherwise prohibited location into a lawful one.
Being towed
The same rule expressly includes vehicles being towed in the prohibition. A towed vehicle should not use hazard warning lights while moving unless the stated motorway or unrestricted-dual-carriageway warning exception applies to the circumstances.
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Hazards are not the UK’s general poor-visibility setting. Highway Code Rule 226 says headlights must be used when visibility is seriously reduced, generally when you cannot see beyond 100 metres (328 feet). Rule 236 says front or rear fog lights should be used only when visibility is seriously reduced and switched off as soon as visibility improves.
Those rules address seeing and being seen in reduced visibility; Rule 116 addresses warning following drivers of a specific hazard. In fog or heavy rain on an ordinary road, use the lighting required by the Highway Code rather than assuming hazard lights are permitted.
New South Wales: hazardous-weather use is expressly recognised
Driving in fog or rain
NSW Government guidance describes hazard lights as flashing orange or red lights and says they may be used while driving in hazardous conditions such as fog or rain. That is materially different from the UK position. A driver in New South Wales may therefore have a lawful weather-related reason to activate hazards while continuing to move.
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The guidance is an NSW example, not a statement of one Australia-wide rule. Road-lighting requirements can differ between states and territories, so a trip across a border requires checking the new jurisdiction’s road rules.
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Stopping in a hazardous position
NSW guidance also permits hazard lights when stopped in a hazardous position, such as where the vehicle obstructs traffic or pedestrians. The reason for activation is the danger created by the stopping place. If the vehicle is safely and legally parked without creating that hazard, the guidance does not say that hazards must remain on merely to increase visibility.
United States: separate the state law from Move Over duties
There is no single federal answer to moving use
The NHTSA material considered here is not a nationwide rule saying that every US driver may, or may not, use hazard lights while moving. Hazard-light permissions and restrictions can be found in state vehicle codes and traffic regulations. Before driving with hazards activated, check the statute or official driver handbook for the state in which the vehicle is travelling.
What NHTSA’s Move Over overview does say
NHTSA says all 50 states have Move Over laws for emergency vehicles displaying flashing lights. It reports that 19 states and Washington, DC extend coverage to all vehicles displaying flashing or hazard lights. The number is time-sensitive; confirm the current law before relying on that count.
Where a Move Over rule applies, NHTSA advises an approaching driver to move to a lane that is not immediately adjacent to the stopped vehicle when that can be done safely. If a lane change is not possible, the driver should slow to a reasonable speed. These instructions concern passing a stopped vehicle; they do not decide whether the vehicle’s own driver was entitled to activate hazards while moving.
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Virginia illustrates why lighting rules must be read separately
Virginia Code § 46.2-1030 is an example of a state lighting provision that is not a hazard-light permission rule. It requires headlights in specified conditions, including when visibility is reduced until people or vehicles are not clearly discernible at 500 feet, and when windshield wipers are being used because of fog, rain, sleet or snow. The statute makes an exception for intermittent wiper use in misting conditions.
The practical lesson is to read the state’s headlight, fog-light, hazard-light and stopped-vehicle provisions separately. Compliance with one does not automatically satisfy the others.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to decide before switching hazards on
- Identify your jurisdiction. Use the country and, where applicable, the state or territory where the vehicle is physically travelling. Do not rely on the law from your home jurisdiction after crossing a border.
- Classify the situation. Are you moving, stopped and obstructing, or approaching another stopped vehicle? Select the rule for that situation rather than searching for a generic “hazards in rain” answer.
- Check whether a specific trigger exists. In the UK, moving use requires the motorway or unrestricted-dual-carriageway warning exception. In NSW, hazardous conditions such as fog or rain are recognised. In the US, the state code controls moving use.
- Use the lighting that addresses the actual risk. In the UK, seriously reduced visibility calls for headlights and, only when appropriate, fog lights. Hazard lights are for the separate warning function described in Rule 116.
- Limit the duration. If the rule permits a warning only until following drivers have seen it, switch the hazards off after that warning has served its purpose. If a vehicle remains stopped in a dangerous position, follow the local rule for that continuing obstruction.
- Check the official wording. Use the current highway code, state or territory road authority guidance, or statute. Rules and state lists can change, especially US Move Over coverage.
Common situations and the safer legal question
Heavy rain while travelling on an ordinary UK road
Rain alone does not fit the UK’s Rule 116 moving exception. Use the required headlights when visibility is seriously reduced and adjust speed and following distance. Do not assume that activating hazards makes ordinary-road driving lawful.
Fog while driving in New South Wales
NSW guidance specifically allows hazards while driving in hazardous conditions such as fog. Apply the rest of the local lighting and speed rules as well; the hazard permission does not suspend those requirements.
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A breakdown blocking a UK lane
If the vehicle is stationary and temporarily obstructing traffic, Rule 116 allows hazard lights to warn approaching road users. On a motorway or unrestricted dual carriageway, the moving-use exception is limited to warning drivers behind of a hazard or obstruction ahead and lasts only long enough for them to observe it.
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A stopped vehicle on a US roadside
The driver should consult the state’s hazard-light and roadside-stopping rules. Approaching motorists should follow the applicable Move Over requirement: change lanes when safe, or slow to a reasonable speed when a lane change cannot be made.
A vehicle being towed in the UK
Rule 116 includes being towed in its prohibition. The motorway or unrestricted-dual-carriageway warning exception must be met; otherwise, moving with hazards activated is not allowed under that rule.
Why a universal yes-or-no answer is unsafe
The UK and NSW official guidance point in opposite directions on using hazards while moving in hazardous weather. Treating one jurisdiction’s practice as an international norm could lead to a ticket, confuse other drivers about your intended manoeuvre, or cause you to use the wrong lighting for the conditions. US Move Over statistics add another layer: they describe duties owed by approaching drivers and do not establish a nationwide moving-use permission.
For construction, roadside maintenance and delivery work, the same distinctions matter. A vehicle temporarily blocking a travel lane, a slow-moving convoy and a vehicle stopped on a shoulder present different legal facts. Use the rule tied to the actual position and movement of the vehicle, and consult the road authority for the route rather than applying a company-wide assumption across jurisdictions.
Practical compliance checklist
- Confirm the country, state or territory before activating hazards.
- Decide whether the vehicle is moving, stopped and obstructing, or being approached.
- For the UK, remember the motorway or unrestricted-dual-carriageway exception is only for warning drivers behind of a hazard or obstruction ahead.
- For the UK, use headlights when seriously reduced visibility means you cannot see beyond about 100 metres, and turn fog lights off when visibility improves.
- For NSW, recognise that official guidance allows hazards while driving in hazardous conditions such as fog or rain, and when stopped in a hazardous position.
- For the US, verify the state’s moving-use rule and separately follow Move Over requirements when approaching a stopped vehicle.
- Use hazards only for the period and purpose the local rule permits.
- Recheck current official guidance before relying on an older rule, state list or roadside procedure.
Bottom line
You are not automatically allowed—or automatically forbidden—to drive with hazard lights on. The UK generally prohibits moving use except for a narrowly defined motorway or unrestricted-dual-carriageway warning; New South Wales allows it in hazardous conditions such as fog or rain; and the United States requires a state-specific answer, while NHTSA’s Move Over guidance focuses on approaching stopped vehicles. Check the current local rule, classify the situation correctly and use hazards only for the warning that rule authorises.
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