United States
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U.S. Route 99W (central California), Manteca to Stockton -
U.S. Route 99W (northern California), Sacramento to Red Bluff -
U.S. Route 99W (Oregon) -
Oregon Route 99W
The following roads have been numbered 99W:
U.S. Route 99W (central California), Manteca to Stockton
U.S. Route 99W (northern California), Sacramento to Red Bluff
U.S. Route 99W (Oregon) 
Oregon Route 99W 
The state highway system of the U.S. state of California is a network of highways that are owned and maintained by the California Department of Transportation (Caltrans).
Pacific Highway is the name of several north–south highways in the Pacific Coast region of the Western United States, either by legislation officially designating it as such or by common usage.
U.S. Route 99 (US 99) was a main north–south United States Numbered Highway on the West Coast of the United States until 1964, running from Calexico, California, on the Mexican border to Blaine, Washington, on the Canadian border. It was assigned in 1926 and existed until it was replaced for the most part by Interstate 5. Known also as the "Golden State Highway" and "The Main Street of California", US 99 was important throughout much of the 1930s as a route for Dust Bowl immigrant farm workers to traverse the state. Large portions are now California State Route 99 (SR 99), Oregon's Routes 99, 99W, and 99E, and Washington's SR 99. The highway in Washington connected to British Columbia Highway 99, whose number was derived from that of US 99, at the Canada–US border.
State Route 99 (SR 99) is a north–south state highway in the U.S. state of California, stretching almost the entire length of the Central Valley. From its southern end at Interstate 5 (I-5) near Wheeler Ridge to its northern end at SR 36 near Red Bluff, SR 99 goes through the densely populated eastern parts of the valley. Cities served include Bakersfield, Delano, Tulare, Visalia, Fresno, Madera, Merced, Turlock, Modesto, Manteca, Stockton, Sacramento, Yuba City, and Chico.
Oregon Route 224 is a state highway which runs through some of Portland's southeastern suburbs and ends in the Cascades.
Oregon Route 10 is an Oregon state highway which serves Portland and some of its western suburbs.
The Intermodal Surface Transportation Efficiency Act of 1991 is a United States federal law that posed a major change to transportation planning and policy, as the first U.S. federal legislation on the subject in the post-Interstate Highway System era.
Oregon Route 18 is a state highway that runs between the Oregon Coast, near Lincoln City, and Newberg. OR 18 traverses the Salmon River Highway No. 39 of the Oregon state highway system, named after the river alongside its westernmost segments.
Harbor Drive is a short roadway in Portland, Oregon, spanning a total length of 0.7 miles (1.1 km), which primarily functions as a ramp to and from Interstate 5. It was once much longer, running along the western edge of the Willamette River in the downtown area. Originally constructed from 1942–43, the vast majority of the road was replaced with Tom McCall Waterfront Park in the 1970s. Signed as U.S. Route 99W, it had been the major route through the city and its removal is often cited as the first instance of freeway removal in the U.S. and as a milestone in urban planning; the original road is remembered as the first limited-access highway built in the city.
Oregon Route 34 is a state highway in the U.S. state of Oregon that runs between the city of Waldport on the Oregon Coast and the city of Lebanon in the western part of the state. OR 34 traverses the Alsea Highway No. 27 from Waldport to Flynn, part of the Corvallis–Newport Highway No. 33 from Flynn to east of Corvallis, and the Corvallis–Lebanon Highway No. 210 from east of Corvallis to Lebanon, of the Oregon state highway system. In Corvallis, OR 34 includes a brief concurrency with U.S. Route 20 and OR 99W over the Pacific Highway West No. 1W.
Oregon Route 99E is an Oregon state highway that runs between Junction City, Oregon and an interchange with I-5 just south of the Oregon/Washington border, in Portland. It, along with OR 99W, makes up a split of OR 99 in the northern part of the state. This split existed when the route was U.S. Route 99, when the two branches were U.S. 99W and U.S. 99E.
Oregon Route 99W is a state-numbered route in Oregon, United States, that runs from OR 99 and OR 99E in Junction City north to I-5 in southwestern Portland. Some signage continues it north to US 26 near downtown, but most signage agrees with the Oregon Department of Transportation's (ODOT) description, ending it at I-5. OR 99W is known by ODOT as the Pacific Highway West No. 1W ; that highway continues north through downtown to the Pacific Highway No. 1 (I-5) in northern Portland, as well as south on OR 99 to the Pacific Highway (I-5) in Eugene.
Oregon Route 141, known as the Beaverton–Tualatin Highway No. 141, is an Oregon state highway which runs from the city of Wilsonville to the southern edge of Beaverton. The highway is 10.46 miles (16.83 km) long.
Oregon Route 194 is an Oregon state highway running from OR 223 near Dallas to OR 99W and OR 51 in Monmouth. OR 194 is known as the Monmouth Highway No. 194. It is 7.56 miles (12.17 km) long and runs east–west, entirely within Polk County.
The West Side Highway is a major road in New York City.
U.S. Route 99 (US 99) was the main north–south United States Numbered Highway on the West Coast of the United States until 1964, running from Calexico, California, on the Mexican border to Blaine, Washington, on the Canadian border. Known also as the "Golden State Highway" and "The Main Street of California", US 99 was an important route in California throughout much of the 1930s as a route for Dust Bowl immigrant farm workers to traverse the state. It was assigned in 1926 and existed until it was replaced for the most part by Interstate 5 (I-5). A large section in the Central Valley is now State Route 99 (SR 99).
Business routes of Interstate 5 (I-5) exist in both California and Washington. There are no business routes in Oregon as that state does not assign such designations for any of its Interstate Highways. However, Oregon Route 99 (OR 99) essentially acts as a business route for most of Oregon, along with OR 99W and OR 99E, which also has its own business route in Salem.
U.S. Route 20 (US 20) is a major west–east cross-state highway in the northern part of the U.S. state of Oregon, especially east of the Cascade Mountains. It connects U.S. Route 101 in Newport on the central Oregon Coast to the Idaho state line east of Nyssa.