Sign 21, known as 'U-turn is prescribed', is a mandatory traffic sign that dictates a specific manoeuvre. When you encounter this sign in Austria, it means you must perform a U-turn. You should position your vehicle early and follow the instruction smoothly, ensuring you are in the correct lane and have checked any accompanying road markings or additional panels that might modify the instruction.
Mastering sign 21, 'U-turn is Prescribed,' is crucial for navigating Austrian traffic rules and passing your theory test. This mandatory sign dictates a specific manoeuvre, requiring careful interpretation of road layout and accompanying instructions for safe execution.
This Austrian mandatory sign requires a specific action rather than merely giving information. It may prescribe direction, lane choice, path use, minimum speed, snow chains, or a particular manoeuvre. Drivers should match the sign to the correct lane and road layout, then check markings, panels, and end signs to understand how long the instruction remains in force. Official catalogue code: 21.
The "U-turn is prescribed" sign requires the direction, path, lane use, minimum speed, equipment, or manoeuvre shown. Position early and follow the instruction smoothly. Catalogue code 21.
Get clear, practical answers to the most common questions about the 21 - U-turn is prescribed 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 Austrian driving theory exam in Austria.
Sign 21, 'U-turn is prescribed', is a mandatory sign. It strictly requires you to execute a U-turn. This means you must turn your vehicle around to travel in the opposite direction, using the path indicated by the sign or associated road markings.
You need to prepare early for the manoeuvre. This involves checking your mirrors, signalling your intention, and moving into the appropriate lane as indicated by the sign or road markings. Always scan for other traffic and ensure the U-turn can be completed safely.
Yes, Sign 21 often works in conjunction with lane markings or additional panels that specify the exact lane or path you must use for the U-turn. You must adhere to these instructions precisely; do not attempt the U-turn from a different lane than prescribed.
If you miss Sign 21 and the prescribed U-turn, or if you are in the wrong lane and cannot safely perform the manoeuvre, you must continue to the next safe opportunity to turn around or follow the general traffic flow. Do not stop suddenly or attempt an illegal turn. Look for a subsequent U-turn sign or a safe place to re-route.
The instruction of Sign 21 remains in effect until you pass an 'end of restriction' sign or until a subsequent traffic sign or rule clearly indicates a different manoeuvre or direction. Always pay attention to further signs after completing the prescribed U-turn.
A clear reference image of the 21 - U-turn is prescribed road sign used in Austria.

The 21 - U-turn is prescribed road sign may also be known by these alternative names or terms.
The 21 - U-turn is prescribed road sign is part of the Austrian Mandatory Signs category, which groups together signs with similar rules and functions.
Master Austrian road signs by comparing similar types, like the 'U-turn is prescribed' sign, to sharpen your recognition skills for the theory test. Effective traffic sign comparison and revision will reduce confusion and boost your confidence in Austrian road rules.

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After reviewing the full list of Austrian road signs, test your recognition skills with targeted practice questions. Explore signs by category to reinforce specific areas of knowledge, ensuring you're fully prepared for the driving theory exam and confident in recognizing any sign on the road.
All Austrian Road Signs List