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
Washington State Route 411 of the road in 2007 were the SR 432 interchange in Longview, SR 411 Spur intersection in Kelso and the Alpha Drive intersection in West Side Highway, all with an estimated daily average of 17,000 motorists. The Nevada Drive junction in Kelso was the busiest segment in 1970, with an estimated daily average of 6,800 motorists. Between 1964 and 1991, SR 411 was longer and extended north to Vader, a city in Lewis County. The former route started at an intersection with PH No. 10 Road west of Castle Rock and traveled north as the West Side Highway, paralleling a