Signalised pedestrian crossings clearly separate when each type of traffic (pedestrians or road vehicles) can use the crossing. Unsignalised crossings generally assist pedestrians, and usually prioritise pedestrians, depending on the locality. Pelican crosswalks use signals to keep pedestrians together where they can be seen by motorists, and where they can cross most safely across the flow of vehicular traffic, whereas zebra crossings are uncontrolled and more appropriate for lower people flows. What appears to be just pedestrian crossings can also be created largely as a traffic calming technique, especially when combined with other features like pedestrian priority, refuge islands, or raised surfaces.