As you approach the roundabout, there’s a sign showing a single white bar on a green background. What does this sign tell you?

Explanation: As you approach a roundabout or a junction, you'll often see signs displaying white bars. These are called countdown markers and they tell you how far it is to the junction. Each bar represents 100 yards, so

• three white bars represent 300 yards
• two white bars represent 200 yards
• one white bar represents 100 yards

The background colour will depend on what kind of road you're driving along. For example, it's blue for motorways and green for primary routes.

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References: Highway Code: Page 112, Know Your Traffic Signs: Page 98