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Tema 14: signing road works in the DGT exam

What changes when the road is under works: who signs it, in what colour, and why works staff can stop you though they are not officers.

Reviewed on 11 October 2026 · sources: BOE and DGT

This tema asks what changes when the road is under works: who signs it, how, and whom you must obey.

  • Works that disturb traffic are signed day and night, and lit by beacons at night or in bad weather.
  • The cost and the responsibility fall on whoever carries out the works: the body doing them or the contractor.
  • You must follow the instructions of staff regulating vehicle movement at works. They are not police officers (agentes), but their instruction is binding.
  • Official catalogue signage is used; only with justification may other signs appear.
  • Carrying out works without authorisation, or removing, hiding, altering or damaging signage, is a very serious offence.

Watch out: it is not the road owner who answers for the works signage, but whoever carries out the works.

In DrivingLingo: review the traffic signs, tema 13 on temporary signing and beacons, tema 10 on vertical signs and practise the .

Source: RGC arts. 139.3, 140.4, 141.4, 148, 149; LSV art. 77.n).

Key rules of topic 14

The duty to sign

Works that disturb traffic must be signed day and night, and lit by beacons at night or in bad weather.

  • The cost falls on whoever carries out the works.
  • Responsibility for the signage lies with the body doing them or the contractor.

Source: RGC art. 148; RGC art. 139.3

Obeying works staff

You are obliged to follow the instructions of staff assigned to regulate vehicle movement at works.

  • They regulate with catalogue signs mounted on a paddle.
  • They are not officers, but their instruction at works is binding.

Source: RGC art. 139.3; RGC art. 141.4

Catalogue signs only

At any works or road activity the official catalogue signage is used; only with justification may other signs appear.

  • Trial stretches with different signs or markings are announced by vertical signage.

Source: RGC art. 149

Unauthorised works

Carrying out road works without authorisation, or removing, hiding, altering or damaging signage, is a very serious offence.

  • It covers both permanent and occasional signage.

Source: RGC art. 140.4; LSV art. 77.n)

Learn the rule, then practise it

Study topic 14 step by step: the rule, its citation and exam-style questions.

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