A slip road, also known as a filter lane in the United Kingdom, is a short road at a junction that allows motorists to change roads without actually entering an intersection. Slip roads are generally small sections of road that allow traffic to join major roads from lesser ones, giving arriving vehicles the chance to speed up in order to match the speed of those already on the road being joined. In Australia, before entering a slip road, drivers must look to ensure that their blind spots are clear of other motorists, cyclists, and pedestrians. Drivers must then give way to any pedestrians crossing the slip road. Before joining the main road from a slip road, drivers must give way to all other traffic even if it is faced with a give-way or with other traffic controls. In countries such as the United Kingdom, slip lanes can be used as part of a "walk with traffic" facility, allowing pedestrians to cross to the triangular island during the vehicle red phase and cross the road while the traffic from their approach has a green. Slip roads are also known as slip lanes or filter lanes. In the US, slip roads are called entrance ramps or exit ramps.