The color of blocks installed before crosswalks is also supposed to vary with crosswalk type: red blocks are to be used before controlled crossings, such as zebra crossings (where pedestrians always have the right of way), pelican crossings (equipped with push-button traffic lights) and puffin crossings (with sensor-equipped push button traffic lights). Other colors (often buff) are to be used at other crosswalks where automobiles have the right of way.