Detour Information Sign
The sign provides information about the detour route
When You See This Sign
When you see orientation sign F23 you should follow the indicated detour route and pay attention to arrows and supplementary signage. Adjust speed and lanes according to temporary markings and follow any instructions from road or worksite attendants.
Rules & Regulations
- F23 is an orientation sign that indicates a designated detour route and shows the direction or destination for road users who must follow a temporary deviation.
- The sign itself provides information, but when used together with prohibitory signs (e.g., "road closed") or worksite devices, you must follow the detour instructions.
- Signs are placed in sequence along the detour route — follow arrows and subsequent orientation signs to stay on the designated detour.
- During a detour normal yield and speed rules apply, as well as any temporary speed limits and lane adjustments; also follow instructions from road or worksite attendants.
Tips for Drivers
- Reduce your speed when you see F23 — detours often pass by work zones, narrow sections, or temporary intersections.
- Watch for the following orientation signs and arrows; they indicate the continued direction and when the detour ends.
- Obey barriers and do not take shortcuts along closed roads or adjacent work areas — the detour is planned for safety.
- Use GPS as a supplement but rely primarily on the temporary signs; navigation apps may suggest routes through closed or prohibited sections.
Common Mistakes
- Thinking that F23 is a permanent direction sign and not realizing that it is often temporary for roadworks or closures.
- Ignoring the sign because your GPS shows a different route — it is the sign and the barriers on site that take precedence.
Test Yourself
Road Sign: Detour Information Sign
What does this sign indicate?
- A It provides information about a diversion route and shows directions to follow when deviating from the regular road.
- B It informs about parking possibilities during the diversion.
- C It informs that the motorway begins after the intersection.
- D It warns of roadworks without any alternative routes indicated.
Exam Tip
On the theory test you may get a question about the nature of F23: remember that the sign itself is informative but in practice must be followed if it is supplemented by closure signs or other temporary regulations.
Did You Know?
Orientation signs for detour routes are often used during major roadworks and may be marked with route letters or numbers to manage multiple concurrent detours in a clear way.
Frequently Asked Questions
Does F23 mean I always must turn according to the arrow?
F23 itself informs of a recommended detour direction, but if it is combined with a closure or prohibition on the normal road, it is mandatory to follow the detour. In other words, follow the sign in the context of the other temporary signage.
Where are orientation signs for detour routes usually found?
They are placed before and along the detour section at roadworks, accidents, or other temporary closures. You will find them on motorways, country roads, and in urban areas depending on where the detour is needed.
Can I use my usual road instead of the detour if it becomes longer?
No, if your usual road is closed or marked as prohibited you must follow the detour for safety and legal reasons. If it is only a recommendation and the road is open, you should still obey all applicable traffic rules.
How do I know when the detour ends?
Continue to follow the orientation signs — they are placed in sequence and there is usually a final sign indicating that the detour ends or that you rejoin the normal road. Pay attention to the signage to return to your regular route.
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