The simplest marked crossings may just consist of some markings on the road surface. In the US these are known as "marked crosswalks." In the UK these are often called zebra crossings, referring to the alternate white and black stripes painted on the road surface. If the pedestrian has priority over vehicular traffic when using the crossing, then they have an incentive to use the crossing instead of crossing the road at other places. In some countries, pedestrians may not have priority, but may be committing an offence if they cross the road elsewhere, or "jaywalk." Special markings are often made on the road surface, both to direct pedestrians and to prevent motorists from stopping vehicles in the way of foot traffic. There are many varieties of signal and marking layouts around the world and even within single countries. In the United States, there are many inconsistencies, although the variations are usually minor. There are several distinct types in the United Kingdom, each with their own name.