Why are warning signs placed on the backs of some heavy goods vehicles?

To warn cyclists about passing on the nearside.

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  1. To show the truck's top speed
  2. To warn cyclists about passing on the nearside ✔
  3. To advertise the truck company

Why: Signs warn cyclists that passing a turning large vehicle on the nearside can be dangerous.

Huh, didn't know that: Signs warn cyclists that passing a turning large vehicle on the nearside can be dangerous.

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References

Answer: To warn cyclists about passing on the nearside. Signs warn cyclists that passing a turning large vehicle on the nearside can be dangerous.

  1. Truck en.wikipedia.org/wiki/Truck
    advocate extra care when passing a large vehicle on the nearside
    Checked 2026-11-07.

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