Spanish Indication Signs (S Series) Explained

Spanish indication signs are the blue and white square panels that inform you about the road ahead rather than ordering you to do something. They carry the letter code S, and they tell you things like where a motorway begins, where a tunnel or a pedestrian crossing is, or that you have entered a Zone 30. On the DGT theory test they appear often, and knowing what they mean is easy points if you learn the main ones.

What are indication signs?

Indication signs (senales de indicacion) are usually square or rectangular, with a blue background and a white symbol. Their job is to give you useful information: the type of road, a facility, or a special area. They do not force an action the way a red-ringed prohibition sign or a blue circular obligation sign does. Think of them as the road talking to you, not commanding you.

That said, some indication signs mark the start of an area with its own rules. When you pass an S-28 (residential street) or an S-30 (Zone 30), the sign informs you that a speed limit and pedestrian priority now apply inside that area. So the panel is informative, but the situation it announces still carries legal duties.

If you want the full picture of how the sign families fit together, start with our Spanish road signs in English guide.

How do indication signs differ from prohibition and obligation signs?

The shape and colour tell you the type before you even read the symbol. Prohibition signs are round with a red border and tell you what you must not do. Obligation signs are round and blue and tell you what you must do. Indication signs are square and blue and simply tell you what is there.

• Round, red border: prohibition (no entry, no overtaking, speed limit).
• Round, blue: obligation (compulsory direction, minimum speed).
• Triangle, red border: warning of a hazard ahead.
• Square, blue: indication, the S series covered here.

Getting the shape and colour logic straight is one of the fastest ways to answer sign questions correctly, because the exam often shows a sign and asks what type it is.

Which S series signs should you know for the DGT test?

The table below lists the main indication signs you are likely to meet, with the official S code and what each one means. Learn these ten and you will recognise the great majority of S signs on the exam.

Keep in mind that the DGT expanded the sign catalogue in 2026, adding low-emission-zone (ZBE) signs and personal-mobility-vehicle (VMP) signs, both live since 5 February 2026. These newer informative panels sit alongside the classic S series above.

What is the difference between S-1 and S-1a?

S-1 marks the start of a motorway (autopista) and S-1a marks the start of a dual carriageway (autovia). Both are fast, divided roads with separated carriageways, and both exclude slow traffic. The difference is one of construction standard: an autopista is built to the highest specification, often with full access control, while an autovia is a step below.

For your day-to-day driving the practical effect is similar. The same fast-road behaviour applies: no pedestrians, no cyclists, no farm vehicles, and a higher minimum speed than an ordinary road. On the test, the key is to match the sign to the correct road name. S-2 then marks the end of the motorway, which is a common point of confusion, so read the S-2 row carefully.

Signs on these high-speed roads often pair with direction and destination panels. We cover those in our guide to Spanish motorway and direction signs.

What do S-28 and S-30 mean for speed?

S-28 marks a residential street where pedestrians have priority and the limit is 20 km/h. S-30 marks a Zone 30, a wider pedestrian-priority area where the limit is 30 km/h. Both are common in Spanish towns, and both appear on the theory test precisely because the speed number matters.

Inside an S-28 residential street, people can be walking and playing in the road, so you drive at walking-plus pace and give way to them. A Zone 30 (S-30) covers a whole neighbourhood or district rather than a single street, keeping traffic calm across a wider area. When you leave the zone, a matching end sign tells you the normal urban limit resumes.

A quick memory hook: the smaller, more protective residential street (S-28) has the lower number, 20; the broader Zone 30 (S-30) carries its speed limit in its very name. Get those two numbers right and you will bank two easy marks.

How are these signs tested on the DGT exam?

Questions usually show a sign and ask what it means, or describe a situation and ask which sign fits. A typical question might display the S-5 tunnel sign and ask what you should do next, with the correct answer being to switch on your dipped headlights. Another might show S-13 and ask what is ahead, testing whether you know it marks a pedestrian crossing.

Because indication signs are informative, the trap is usually to confuse them with a lookalike from another family, or to mix up a start sign with its end sign. Slow down, read the shape and colour, then read the symbol. If it is a blue square, you are almost certainly looking at an S sign telling you what is there, not ordering an action.

The best preparation is to see them in real exam-style questions. Practise signs by topic on our practice topics page.

Frequently asked questions

Are indication signs the same as information signs?

In everyday English, yes. The Spanish term is senales de indicacion, and they carry the S code. They inform you about the road, a facility, or a special area rather than ordering or prohibiting an action.

Do I have to obey an indication sign?

Indication signs mainly inform, but some announce an area with real rules. An S-28 or S-30 tells you a speed limit and pedestrian priority now apply, and those limits are legally binding once you enter the area.

What colour and shape are S series signs?

They are square or rectangular with a blue background and a white symbol. That shape and colour combination is the quickest way to tell an indication sign from a round prohibition or obligation sign on the test.

What is the difference between S-1 and S-2?

S-1 marks the start of a motorway (autopista), and S-2 marks the end of it. If you mix them up you will lose marks, so link S-1 to the beginning and S-2 to the end whenever you see them.

Sources

• DGT, catalogo oficial de senales.
• Reglamento General de Circulacion (Real Decreto 1428/2003).
• DGT, 2026 sign catalogue update (ZBE and VMP signs).

Last updated: August 2026.