Road signs in Singapore amber beacons, and are valid yet uncommon on the roads. The road markings and road dividers are "white zig zag lines" that indicate a zebra crossing in the vicinity, similar to the United Kingdom and Republic of Ireland Zebra crossing rules. On approach, regardless of the absence of any pedestrians, all motorists are required to keep left of the divider, prepare to stop and stay in their respective lanes, i.e. no overtaking is permitted. When pedestrians are present at the side of a zebra crossing, all motorists are obligated to give priority to pedestrians crossing the zebra crossing bars, by
Riverside Drive (Manhattan) the south as "Riverside Boulevard." Starting at 72nd Street, Riverside Drive passes through the Manhattan neighborhoods of the Upper West Side, Morningside Heights, over Manhattanville in West Harlem by way of the Riverside Drive Viaduct and through Washington Heights. Below 72nd Street, Riverside Drive continues as Riverside Boulevard which stretches through Riverside South to 59th Street where it merges into the West Side Highway. Only a few stretches of Riverside Drive were built along an older road; due to the hilly terrain, Riverside Drive crosses a natural cleft in the bedrock at 87th Street on an iron viaduct and passes