A white line like this along the centre of the road is a

Explanation: The centre of the road is usually marked by a broken white line, with lines that are shorter than the gaps. When the lines become longer than the gaps this is a hazard warning line. Look well ahead for these, especially when you are planning to overtake or turn off.

Category: Road and Traffic Signs

References: The Official DVSA Guide to Driving: Section 6, Highway Code: Rule 127, Highway Code: Page 114, Know Your Traffic Signs: Page 62