Interchange Number
The sign indicates the number of the interchange
When You See This Sign
When you see the interchange number sign you should note the number as an exact location reference for the current exit or interchange. You normally do not need to do anything immediately, but use the number to confirm your position, prepare for an exit, or provide the location in an emergency call.
Rules & Regulations
- The sign is an informational sign and indicates the interchange's unique number – it is not a prohibition or mandatory sign.
- The number is used as a reference in road traffic systems, maps, and by emergency services and road maintenance to precisely identify the location.
- You should not start changing lanes or braking solely because of the sign; use the number for orientation and plan maneuvers in good time.
- The sign's number should be given during emergency calls or accident reporting to facilitate quick location of the site.
Tips for Drivers
- Take note of the interchange number as you pass, especially if your route plan or GPS refers to a number – it confirms you are in the correct place.
- Use the number in emergencies or if you need to provide an exact location for roadside assistance or service; it saves time for responders.
- Combine the interchange number information with other road signs (e.g., lane choice and directions) before changing lanes or taking an exit.
- If you are driving with passengers, ask them to read the number out on long stretches so you can focus on traffic when receiving instructions.
Common Mistakes
- Thinking that the interchange number is an instruction to immediately turn or change lanes – it is only information.
- Confusing the interchange number with exit-number systems from other countries and assuming the digit indicates distance or priority.
- Failing to memorize or note the number during accidents/emergencies and instead trying to describe the surroundings, which makes quick location more difficult.
Test Yourself
Road Sign: Interchange Number
What does this sign mean for you as a driver?
- A It indicates the interchange's number
- B It shows the speed limit at the interchange
- C It shows the direction to the nearest rest area
- D It shows the distance to the next town
Exam Tip
On the theory test you may get a question that tries to make you believe the sign imposes a driving obligation or right-of-way. The correct answer is that it is an informational sign; it only indicates which interchange it is and should be used for orientation or emergency calls.
Did You Know?
Interchange numbers are used in national road registers and by emergency call centers and the national road authority to quickly locate incidents. The sign is mainly found on motorways and other major grade-separated roads at exits and complex interchanges to help with orientation in a large road network.
Frequently Asked Questions
Does the interchange number mean I must exit here?
No. The sign is purely informational and gives the interchange number. You should not change lanes or exit solely because of the sign, but make maneuvers according to your plan and the traffic situation.
Can I use the interchange number in an emergency call?
Yes. Providing the interchange number during an emergency call or when contacting roadside assistance helps responders and authorities locate the site quickly.
Is the same number shown in GPS and road maps?
In many cases the interchange number matches what is shown in digital maps and the national road authority's register, but some navigation apps instead display road or exit names. It's good to check both sources if you are unsure.
Why do interchange numbers exist at all?
The numbers were introduced to create unambiguous reference points in the road network, which facilitates navigation, traffic management, maintenance, and rapid response to accidents or disruptions.
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