Frontage roads, or service roads, run parallel to a controlled-access facility, serving as connectors between ramps of the higher-speed facility and intersections of lower-speed local streets. Their primary purpose is to provide access to local properties and allow the mainlane users to bypass intersections and driveways. They can either have one-way or two-way operation. Frontage road segments are typically bound by ramps, signalized intersections, or intersections with stop or yield control.