Limited Axle Load
The maximum permitted axle load is indicated on the sign.
When You See This Sign
When you see the sign, you should immediately assess whether any of your axles risk exceeding the stated value. If you are unsure or know that an axle is over the limit, you must choose another route, unload, or redistribute the load — do not continue past the sign.
Rules & Regulations
- The sign indicates the maximum permitted axle load in tonnes (t) for each individual axle.
- The limit applies to all axles on the vehicle, including trailer axles; if any axle is loaded above the limit, passage is prohibited.
- The restriction applies regardless of the vehicle's total weight (gross weight) — it is the axle load that determines compliance.
- Any exceptions or additional conditions may be shown on a supplementary plate beneath the sign (e.g., 'local traffic' or a time specification).
Tips for Drivers
- Check the vehicle's axle loads in the vehicle documents or on a weighbridge or at a weigh station before choosing a route if you suspect high loading.
- Distribute the load as evenly as possible to avoid any single axle exceeding the limit.
- Plan alternative routes in advance when driving a heavy vehicle so you can avoid roads with axle load restrictions.
- Remember that axle loads can change when loading or refueling and that trailer axles also count.
Common Mistakes
- Confusing axle load with total weight and thinking the sign only controls the vehicle's combined weight.
- Believing the restriction only applies to heavy trucks and not realizing that lighter vehicles with uneven or heavy loads can also violate the sign.
- Interpreting the value as the maximum weight for an axle pair instead of for each individual axle.
Test Yourself
Road Sign: Limited Axle Load
What should you consider here?
- A There is a limit for maximum axle load; vehicles with an axle load greater than stated are not allowed to pass.
- B The road surface is slippery and you should maintain a lower speed.
- C Maximum gross vehicle weight is indicated.
- D Only four-wheel-drive vehicles are allowed to pass.
Exam Tip
On the theory test you may get a question comparing 'axle load' and 'total weight' — the correct answer is that the C23 sign indicates the maximum permitted axle load per individual axle, not the vehicle's total weight.
Did You Know?
Axle load restrictions are often used on bridges, weak road surfaces, and in agricultural areas to protect structures and the road surface from damage caused by concentrated loads.
Frequently Asked Questions
What does the number on the sign mean?
The number shows the maximum permitted axle load in tonnes (t) for each individual axle. If the sign shows '8 t' it means that no axle may be loaded with more than 8 tonnes.
Does the sign also apply to my trailer?
Yes. Trailer axles are counted separately and must also comply with the stated limit. Neither the towing vehicle's nor the trailer's axles may exceed the value.
How do I check my axle load?
The safest way is to weigh each axle on a certified vehicle scale or at a weigh station. You can also check the technical data for the vehicle and combination and adjust the load distribution accordingly.
What happens if I pass the sign with too high an axle load?
You may be stopped and ordered to take a detour, fined, or held liable to pay for damage to the road. Authorities may also require you to unload or weigh the vehicle immediately.
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