There are many common questions about road signs and signals, this time we will explain about “headlights question mark”.

The sign, which has the code S-24, normally works in conjunction with another, R-413.

Let´s look at a common scenario, a tunnel, where there are also some other changes to rules which we discuss another time.

We now have to remember one of the basics of traffic signs, circles give us orders (things we must or must not do), whereas squares or rectangles are informative.

As we approach a tunnel, we see R-413, a blue circular sign featuring a pictogram of headlights. telling us we must switch our lights on.

As we leave the tunnel, we see sign S-24, which is a rectangular sign featuring a pictogram of headlights and a question mark.

Now, back to basics again. The approach sign, R-413, tells us we must put our headlights on. But, when we leave the tunnel, a sign cannot tell us we must switch them off, as we could be emerging during the night or in poor visibility, and so S-24, an informative sign, tells us to check if we still need our headlights on or not.

As a final note, remember that when we talk about headlights, we don´t mean Daytime Running Lights (DRL), they are not sufficient when it comes to illuminating areas such as tunnels, or at night.

This article has been brought to you with

CostaBlancaPeople.com - Your essential weekly read.

All our partners - Working together for safer roads


  • Future Roads

    A team of researchers from the Universitat Politècnica de València (UPV), the Centro Unive…
  • National Speed Limit

    On some 7,000 kilometres of the secondary road network in Spain, the maximum permitted spe…
  • More than 300 Deaths Caused by Distractions

    For the fourth year in a row, distractions continue to be the leading cause of fatal traff…
Load More Related Articles
  • National Speed Limit

    On some 7,000 kilometres of the secondary road network in Spain, the maximum permitted spe…
  • Walk Safely

    What is a pedestrian? According to the dictionary of the Royal Spanish Academy (RAE), a pe…
  • I Forgot my Licence!

    It is mandatory to carry your driving licence with you when you drive a car in Spain. The …
Load More In F.A.Q.