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Traffic signs

Traffic rules

An additional sign is a traffic sign placed directly below another sign to provide extra information or clarify how the main sign should be understood. It can specify conditions such as distance, time periods, road users affected, directions, or special circumstances. Additional signs do not create new rules by themselves but modify, limit, or explain the meaning of the sign above them so drivers can apply the rule correctly in that specific situation.

Perpendicular parking partially on sidewalk.

11. For buses

The supplementary sign for buses is a traffic panel placed below a main sign to indicate that the rule, restriction, or permission applies specifically to buses. A bus is a motor vehicle designed for carrying multiple passengers, typically 9 or more seats including the driver.

12. For dangerous cargo

The supplementary sign for dangerous cargo (also called for vehicles carrying hazardous materials) is a traffic panel placed below a main sign to indicate that the rule, restriction, or permission applies specifically to vehicles transporting dangerous goods. Dangerous cargo includes substances that pose risks to health, safety, or the environment. Often classified under ADR (European Agreement concerning the International Carriage of Dangerous Goods by Road).

13. For low-emission vehicles

The supplementary sign for low-emission vehicles is a traffic panel placed below a main traffic sign to indicate that the rule, restriction, or permission applies specifically to low-emission vehicles—typically for environmental protection purposes. A low-emission vehicle (LEV) produces significantly fewer pollutants than standard vehicles. This includes: Eelectric vehicles (EVs), plug-in hybrids (PHEVs), hydrogen/fuel cell vehicles and some Euro 6+ compliant petrol/diesel cars.

14. Disabled allowed

A supplementary sign disabled allowed (often with a wheelchair symbol ♿) is used beneath a main traffic sign to indicate an exception or specific permission for persons with disabilities—typically those with a valid disabled parking permit. May include text: “Disabled allowed”, “Except disabled”, Disabled only”

15. Personal transporters allowed

A supplementary sign Personal transporters allowed indicates that users of personal transporters are permitted in an area where other road users may be restricted or prohibited. Access or use is allowed for personal transporters, such as: segways, self-balancing scooters, Eelectric unicycles, hoverboards. May include text: “Personal transporters allowed”, “Except personal transporters”.

16. Cyclists allowed

A supplementary sign cyclists allowed indicates that cyclists (bicycle riders) are permitted to access or use the road, lane, or area, even if it is otherwise restricted. Access is allowed for cyclists, either as an exception to a restriction or as an indicated user group. May include text: “Cyclists allowed”, “Except bicycles”, “Bicycles permitted”.

17. Motorcycles allowed

The supplementary sign motorcycles allowed indicates that motorcycles are permitted to access or use a road, path, or area, even if it is generally restricted by the main sign. Motorcycles are excepted from the restriction indicated above (e.g. no entry, no motor vehicles, no parking, etc.). All other vehicles or users must comply with the restriction unless also excepted. May include text: “Motorcycles allowed”, “Except motorcycles”.

18. Cars allowed

The supplementary sign cars allowed indicates that passenger cars are permitted to access, enter, or use a road, area, or facility—even if the main traffic sign shows a restriction. This sign modifies the main traffic sign to allow cars, while still prohibiting other vehicles or users not mentioned. May include text: “Cars allowed”, “Except cars”.

19. Electric cars allowed

The supplementary sign electric cars allowed indicates that electric vehicles (EVs) are permitted to access, enter, or park in an area where other vehicles may be restricted. Electric cars are excepted from the restriction on the main sign. May include text: “Except electric cars”, “Electric vehicles allowed”, “Only for EVs”.

20. Taxis allowed

The supplementary sign taxis allowed indicates that taxis are permitted to access, enter, or use a road, lane, or area, even if other vehicles are restricted by the main sign. Licensed taxis are excepted from the restriction indicated on the main sign above. All other road users (including private cars or ride-hailing services, unless also licensed as taxis) must follow the restriction. May include text: “Taxis allowed”, “Except taxis”, “Only for taxis”.

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