Explanation: You need to know the difference between the normal centre line and a hazard warning line. If there is a hazard ahead, the markings are longer and the gaps shorter. This gives you advanced warning of an unspecified hazard ahead.
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
