The S4 road sign, depicting a passenger car towing a trailer, is an important indicator on Swedish roads. It signifies that specific information, such as speed limits or route guidance, applies directly to vehicles configured as a car and trailer combination. When you see this symbol, it's crucial to recognise that standard car rules may not apply, and you must pay close attention to any accompanying instructions to ensure safe towing and compliance with traffic regulations.
Learn the key details of the S4 - Passenger Car with Trailer road sign, including its function, what it communicates to drivers, and how it applies in real traffic situations in Sweden. Use this overview to understand the sign clearly and recognise it confidently during the Swedish driving theory exam.
The S4 symbol shows a passenger car with a towed trailer. It is used on Swedish direction signs and supplementary plates to indicate that the message concerns car-and-trailer combinations, which may face different speed limits, restrictions, or recommended routes. Trailer combinations can require longer braking distances and wider turning space, so signage may guide them differently. In practice, this symbol helps you quickly identify rules that apply because you are towing.
This symbol indicates a passenger car towing a trailer. When shown, the information applies to cars with a connected trailer.
Get clear, practical answers to the most common questions about the S4 - Passenger Car with Trailer 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 Swedish driving theory exam in Sweden.
The S4 road sign visually represents a passenger car that is towing a trailer. Its purpose is to alert drivers that any subsequent information or regulations shown alongside it are specifically intended for car-and-trailer combinations. This helps differentiate rules for towing vehicles from those for regular passenger cars.
You must pay close attention to the S4 sign whenever you are driving a passenger car that is legally towing a trailer. If the sign appears, any associated speed limits, route recommendations, or restrictions apply directly to your vehicle configuration. Ignoring these specific instructions can lead to unsafe driving conditions or fines.
Yes, it can. When the S4 sign is displayed, it often indicates that a different speed limit applies to cars towing trailers than to regular passenger cars. Always check for any accompanying speed limit signs or supplementary plates that provide the specific speed for your towing combination.
A common trap is assuming that general traffic signs apply to your car-and-trailer combination without checking for specific trailer guidance. Learners might also forget that towing affects braking distance and manoeuvrability, so any special instructions indicated by the S4 sign are there for a reason. Always read the sign and any supplementary information carefully in the exam context.
No, the S4 sign specifically refers to passenger cars towing trailers. Heavy trucks and their trailers are typically covered by different signage and regulations, often indicated by signs depicting larger vehicles or specifically mentioning 'heavy vehicle' or 'truck'.
A clear reference image of the S4 - Passenger Car with Trailer road sign used in Sweden.

The S4 - Passenger Car with Trailer road sign may also be known by these alternative names or terms.
The S4 - Passenger Car with Trailer road sign is part of the Symbols (S) category, which groups together signs with similar rules and functions.