Additional Panels Under Spanish Signs Explained

Additional panels are the small white rectangular signs mounted directly under a main road sign. They do not stand alone. Instead, they qualify the sign above them: telling you how far away a hazard is, how long a rule lasts, which vehicles it affects, or when it applies. Read the panel and the main sign together, or you will misjudge the situation. This guide explains each type of panel with everyday examples so you know exactly what changes.

What are additional panels?

An additional panel (in Spanish, panel complementario) is a white rectangle with black text, numbers, or arrows, fixed to the same post just below a warning, prohibition, obligation, or indication sign. Its job is to add detail the main sign cannot show on its own. The main sign tells you what; the panel tells you where, how far, how long, when, or for whom.

Because the panel modifies the sign, you always read the two as one message. A prohibition sign with a panel underneath is not the same rule as the sign on its own. Miss the panel and you can brake too early, park where you should not, or assume a limit has ended when it has not.

How do distance panels change a sign?

A distance panel shows a number followed by a unit, such as "200 m". It tells you the hazard or rule begins that far ahead, not at the sign itself. This is common under warning signs on faster roads, where you need time to react before you reach the point.

Here is an everyday example. You see a "slippery road" warning with a panel reading "300 m" below it. The road is not slippery where you are standing. The risk starts 300 metres further on, giving you time to ease off the accelerator and increase your following distance before you get there. Without the panel, you might expect the hazard immediately and brake in the wrong place.

What does a length panel tell you?

A length panel also shows a distance, but it means something different: it tells you how long the stretch covered by the sign continues. Instead of "the hazard is X metres ahead", it says "this condition lasts for X metres from here".

Imagine a bends warning with a panel reading "5 km". That tells you the winding section runs for the next five kilometres, so you should stay alert and hold a steady, careful speed the whole way, not just around the first curve. Length panels are common on mountain roads, roadworks, and long stretches of poor surface. The clue is context: a distance-to-hazard panel usually appears once at the start, while a length panel describes the extent of what follows.

How do panels show the extent of a prohibition?

Some panels use arrows to show where a prohibition starts, continues, or ends. An upward arrow means the restriction begins here. A double arrow means it continues along the stretch you are on. A downward or turned arrow marks the point where it ends. These panels are common under no-parking and no-stopping signs.

Picture a "no parking" sign with a panel showing an arrow pointing up the street. It means the ban starts at that sign and applies in the direction of the arrow. Further along, the same sign with a panel pointing the other way marks the end of the no-parking zone. Read the arrow and you know exactly which section of kerb is affected. For the signs these panels sit under, see our guide to Spanish prohibition signs explained.

How do panels limit a rule to certain vehicles?

A vehicle-type panel shows a symbol or word naming the vehicles a sign applies to. The main sign then affects only those vehicles, and everyone else can carry on as normal. This narrows a broad-looking sign down to a specific group.

A clear example is a "no entry" or speed sign with a panel showing a lorry symbol. The rule applies to trucks, not to cars or motorbikes. You might see a no-overtaking sign that, thanks to its panel, only bans lorries from overtaking, while cars may still pass when safe. Always check the panel before you assume a sign is aimed at you. A rule that looks like it blocks your route may only apply to heavy goods vehicles or buses.

How do panels set the days or times a rule applies?

A time panel shows hours, and sometimes days, when the sign is in force. Outside those hours the rule does not apply. This is how a single sign can manage parking that is banned only during business hours, or a restriction that runs only on working days.

A typical case is a "no parking" sign with a panel reading something like "8 to 20 h". Parking is only forbidden between those hours; at night the space may be free to use. You will also see panels that list days, such as working days only, or that separate different rules for different time bands. Read the whole panel before you leave the car. Getting the hours wrong is one of the easiest ways to collect a fine.

What is a pre-signalling STOP panel under a give-way sign?

Sometimes a give-way sign carries a panel that pre-signals a STOP ahead. It warns you that although this junction only asks you to give way, the next one further along will require a full stop. It is an early heads-up, not an instruction to stop where you are.

The point is to prepare you. You approach knowing that after this junction you will meet a STOP sign, so you can plan your speed and position early rather than being surprised. When you reach the STOP itself, the normal rule applies: you must come to a complete halt at the line, then give way before pulling out. To see how give-way and STOP fit into the wider set, read Spanish road signs in English, and drill the ones you find hardest on the practice topics page.

Frequently asked questions

What is an additional panel on a Spanish road sign?

It is the small white rectangular sign fixed just below a main sign. It adds detail the main sign cannot show alone, such as the distance to a hazard, the length of a stretch, the vehicles affected, or the hours a rule applies.

Does the panel change what the main sign means?

Yes. You must read the panel and the main sign together as one message. The same prohibition sign means something different with a time panel, an arrow panel, or a vehicle panel underneath it.

What is the difference between a distance panel and a length panel?

A distance panel tells you how far ahead the hazard or rule begins, for example "200 m" before a bend. A length panel tells you how long the condition lasts once it starts, for example a winding section that runs for "5 km".

How do I know if a sign only applies to my vehicle?

Check for a vehicle-type panel underneath. If it shows a lorry, bus, or other symbol, the sign applies only to those vehicles. If there is no such panel, the sign generally applies to everyone unless the rules say otherwise.

Why does a give-way sign sometimes have a STOP panel below it?

That panel pre-signals a STOP at the next junction. It warns you early so you can adjust your speed. You still only give way at the current junction, then make a full stop when you reach the actual STOP sign further along.

Sources

• DGT, catalogo oficial de senales.
• Reglamento General de Circulacion (Real Decreto 1428/2003).

Last updated: August 2026.