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53-506: Primary State Highways were major state highways in the U.S. state of Washington used in the early 20th century. They were created as the first organized road numbering system in the state in stages between 1905 and 1937 and used until the 1964 state highway renumbering . These highways had named branch routes as well as secondary state highways with lettered suffixes. The system of primary and secondary state highways were replaced by sign routes (now state routes) to consolidate and create

106-457: A controlled-access freeway , from an intersection with SR 99 and an interchange with Interstate 5 (I-5) in Federal Way through the cities of Auburn , Kent , Covington , and Maple Valley . SR 18 becomes a two-lane rural highway near Tiger Mountain as it approaches its eastern terminus, an interchange with I-90 near the cities of Snoqualmie and North Bend . SR 18

159-512: A branch of State Road 5 that ran from the main highway in Auburn to State Road 1 and U.S. Route 99 (US 99) in Federal Way via Peasley Canyon . The branch was retained by State Road 5 when it was re-designated as PSH 5 as a new highway code was established in 1937. A branch of PSH 2 was designated in 1949, traveling southwest from North Bend , around Tiger Mountain and through Auburn before ending at

212-506: A designated National Highway System , but the system is completely unsigned, aside from the Trans-Canada routes. This makes Canada unique in that national highway designations are generally secondary to subnational routes. In Germany , state roads ( Landesstraßen or Staatsstraßen ) are a road class which is ranking below the federal road network ( Bundesstraßen ). The responsibility for road planning, construction and maintenance

265-417: A diamond interchange and 256th Street Southeast in a partial cloverleaf interchange before leaving Covington. SR 18 intersects Southeast 231st Street in a diamond interchange located north of Maple Valley , providing a connection to SR 169 , while the freeway travels on an overpass over SR 169 towards a partial cloverleaf interchange with 244th Avenue. The SR 18 freeway ends northeast of

318-781: A junction with PSH 1 and US 99 in Milton . The designation had been the result of lobbying from business leaders in Tacoma, who sought a direct connection to Snoqualmie Pass that would improve access to Eastern Washington. Construction on the Echo Lake Cutoff Road, along the route of the North Bend–Auburn branch of PSH 2 and the Auburn–Federal Way branch PSH 5, began in 1955. The two-lane highway would cost $ 9 million (equivalent to $ 102 million in 2024 ) and

371-508: A more organized and systematic method of numbering the highways within the state. The first state road, running across the Cascade Range roughly where State Route 20 now crosses it, was designated by the legislature in 1893 (However, this road wasn't actually opened until 1972). Two other roads—a Cascade crossing at present State Route 410 and a branch of the first road to Wenatchee —were added in 1897. The Washington Highway Department

424-581: A partial cloverleaf interchange with Issaquah-Hobart Road at the base of Tiger Mountain , becoming a two-lane highway with at-grade intersections for the remainder of its route. The highway travels on the east side of Tiger Mountain in the Issaquah Alps and provides access to a trailhead in Tiger Mountain State Forest before it reaches its eastern terminus, a diamond interchange with I-90 located west of North Bend . I-90 provides access to

477-526: A population of at least 10,000 inhabitants are urban roads (type D and E) under the jurisdiction of the relevant municipalities. The state highway that cross towns or villages with a population of less than 10,000 inhabitants are urban roads (type D and E) under the jurisdiction of the municipality, subject to authorization from ANAS . State highways in India are numbered highways that are laid and maintained by state governments . Mexico 's State Highway System

530-523: A state or province include both nationally numbered highways and un-numbered state highways. Depending on the state, "state highway" may be used for one meaning and "state road" or "state route" for the other. In some countries such as New Zealand , the word "state" is used in its sense of a sovereign state or country. By this meaning a state highway is a road maintained and numbered by the national government rather than local authorities. Australia 's important urban and inter-regional routes not covered by

583-648: A ten-year period, giving the highway a reputation of being a "dangerous roadway". WSDOT widened SR 18 to four lanes and added new interchanges between SR 167 and the Green River within Auburn. The Washington State Legislature briefly planned to toll the new SR 18 freeway in January 1995 to pay off loans for re-construction, but the plan was protested by local residents and rejected months later in May. Additional work

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636-608: A three-digit number designation, preceded by D . Provincial roads ( Turkish : İl yolu ) are secondary roads, maintained by respective local governments with the support of the KGM. The roads have a four-digit numbering grouped as two pairs, pairs are separated by a dash. First pair represents the license number of that province . State highways are generally a mixture of primary and secondary roads, although some are freeways (for example, State Route 99 in California, which links many of

689-732: Is 100 km/h, with reductions when one passes through a densely populated area. The highways in New Zealand are all state highways, and the network consists of SH 1 running the length of both main islands, SH 2–5 and 10–58 in the North Island, and SH 6–8 and 60–99 in the South Island. National and provincial highways are numbered approximately north to south. State Highway 1 runs the length of both islands. Local highways ( Korean :  지방도 ; Hanja :  地方道 ; RR :  Jibangdo ; MR :  Chipangdo ) are

742-482: Is a system of urban and state routes constructed and maintained by each Mexican state. The main purpose of the state networks is to serve as a feeder system to the federal highway system. All states except the Federal District operate a road network. Each state marks these routes with a white shield containing the abbreviated name of the state plus the route number. New Zealand state highways are national highways –

795-489: Is designated as part of the National Highway System for its whole length, classifying it as important to the national economy, defense, and mobility. WSDOT designates the entire route of SR 18 as a Highway of Statewide Significance, which includes highways that connect major communities in the state of Washington . The modern corridor that SR 18 follows was added to the state highway system in 1931 as

848-511: Is divided into states and has state highways. For example, the longest highway in the state of São Paulo , the Rodovia Raposo Tavares , is designated as SP-270 and SP-295 . Canada is divided into provinces and territories, each of which maintains its own system of provincial or territorial highways, which form the majority of the country's highway network. There is also the national transcontinental Trans-Canada Highway system, which

901-488: Is free to choose a different marker, and most states have. States may choose a design theme relevant to its state (such as an outline of the state itself) to distinguish state route markers from interstate, county, or municipal route markers. Washington State Route 18 State Route 18 ( SR 18 ) is a 28.41-mile-long (45.72 km) state highway in the U.S. state of Washington , serving southeastern King County . The highway travels northeast, primarily as

954-596: Is marked by distinct signs, but has no uniform numeric designation across the country. In the eastern provinces, for instance, an unnumbered (though sometimes with a named route branch) Trans-Canada route marker is co-signed with a numbered provincial sign, with the provincial route often continuing alone outside the Trans-Canada Highway section. However, in the western provinces, the two parallel Trans-Canada routes are consistently numbered with Trans-Canada route markers; as Highways 1 and 16 respectively. Canada also has

1007-563: Is not a road class. The Strade Statali , abbreviated SS, is the Italian national network of state highways. The total length for the network is about 25.000 km (15.534 mi). The Italian state highway network are maintained by ANAS . From 1928 until 1946 state highways were maintained by Azienda Autonoma Statale della Strada (AASS). The next level of roads below Strada Statali is Strada Regionale ("regional roads"). The routes of some state highways derive from ancient Roman roads , such as

1060-735: Is now State Route 20 ) from Newport to the Canada-United States border This route followed U.S. Route 10/Interstate 90 from Ellensburg to George , State Route 281 from George to Quincy , and State Route 28 from Quincy to Davenport Known as the Evergreen Highway, the route followed State Route 14 (designated as Washington State Route 12 from 1964-67) from Vancouver, Washington to Maryhill , U.S. Route 97 from Maryhill to Toppenish and State Route 22 from Toppenish to Buena . This route followed U.S. Route 101 from Olympia to Aberdeen. This route ran on U.S. Route 97 from

1113-406: Is vested in the federal states of Germany. Most federal states use the term Landesstraße (marked with 'L'), while for historical reasons Saxony and Bavaria use the term Staatsstraße (marked with 'S'). The appearance of the shields differs from state to state. The term Land-es-straße should not be confused with Landstraße , which describes every road outside built-up areas and

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1166-628: The Green River Valley and across the Cascade Range to a junction with PSH 3 in Yakima . The section from Enumclaw to Yakima was co-signed with US 410 . PSH 5 had several branch routes that connected to Renton , Tacoma , Mount Rainier National Park , and Cayuse Pass . Two branches, the White Pass Highway and Naches Pass Highway , were fully not built at the time. During

1219-523: The Pacific Highway , in the city of Federal Way . The highway travels due east through an intersection with the Enchanted Parkway, which carries SR 161 southwards towards Wild Waves Theme Park and the city of Puyallup , to a hybrid cloverleaf - stack interchange with I-5 , providing access to Seattle and Vancouver, British Columbia to the north, and Tacoma and Portland, Oregon to

1272-609: The Strada statale 7 Via Appia , which broadly follows the route of the Roman road of the same name . Other examples are the Strada statale 1 Via Aurelia ( Via Aurelia ) and the Strada statale 4 Via Salaria ( Via Salaria ). Since the reforms following the birth of the Kingdom of Italy in 1861, the State took charge of the construction and maintenance of a primary network of roads for connections between

1325-670: The 1960s, at the behest of the state legislature following the 1962 World's Fair in Seattle. The signs for the new highway numbers, which would be organized based on their general direction and—for secondary routes—a leading digit, first were posted in late 1963 and took effect in January 1964. The new numbers also coincided with existing U.S. Routes and new Interstate Highways to reduce confusion and eliminate duplicate numbers. The PSH/SSH signs were removed by 1970. Secondary State Highways (SSH) were branches of Primary State Highways with lettered suffixes used from 1937 to 1964. PSH 1 followed

1378-598: The 1964 renumbering, the trunk route of PSH 5 was divided between SR 167 from Seattle to Enumclaw and US 410 (now SR 410 ) from Enumclaw to Yakima. SR 167 was later rerouted away at Auburn, leaving the former highway to Enumclaw signed as SR 164 . Its branches became various highways, including SR 7 from Tacoma to Morton , the former SR 14 (now US 12 ) from Morton to Yakima, SR 165 , SR 169 , and SR 706 . The route followed present-day U.S. Route 2 from Spokane to Newport, and State Route 31 (a portion of which

1431-427: The 32-mile-long (51 km) route was chosen to avoid Tiger Mountain and connect the city of Tacoma to Snoqualmie Pass . The first section, between US 99 and Auburn, was opened on December 19, 1958. SR 18 was designated on the corridor during the 1964 state highway renumbering and codified into state law in 1970, replacing the branches of PSH 2 and PSH 5. The final 7 miles (11.27 km) of

1484-580: The Echo Lake Cutoff, from an entrance to Tiger Mountain State Forest to I-90 , was officially opened on December 1, 1964. A new interchange with I-5 in Federal Way was opened to traffic on January 31, 1967, officially completing SR 18. Expansion of SR 18 from a two-lane rural road to a four-lane controlled-access freeway began in 1992 response to six fatalities in over 170 accidents in

1537-562: The National Highway or National Route systems are marked under the State Route system. They can be recognised by blue shield markers. They were practically adopted in all states by the end of the 1980s, and in some states, some less important National Routes were downgraded to State Routes. Each state has or had its own numbering scheme, but do not duplicate National Route numbers in the same state, or nearby routes in another state. As with

1590-468: The National Routes and National Highways, State Routes are being phased out in most states and territories in favour of alphanumeric routes. However, despite the fact that Victoria has fully adopted alphanumeric routes in regional areas, state route numbers are still used extensively within the city of Melbourne as a part of its Metropolitan Route Numbering Scheme . Brazil is another country that

1643-597: The Tri-Cities), U.S. Route 410 (now U.S. Route 12 ) from the Tri-Cities to Clarkston, U.S. Route 195 from Clarkston to Pullman, SR 27 from Pullman to Oaksedale, US 195 from Oakesdale to Spokane, U.S. Route 2 from Spokane to Mead and U.S. Route 395 from Mead to the U.S.-Canada border. Spurs extended along I-82/, SR 125 and SR 129 from Tri-Cities, Walla Walla and Clarkston to the Oregon State Line This route

List of Primary State Highways in Washington - Misplaced Pages Continue

1696-899: The U.S.-Canada border to Wenatchee, and State Route 28 from Wenatchee to Quincy. A spur extended along State Route 17 from Brewster to Coulee City This route followed U.S. Route 395 from Pasco to Ritzville and U.S. Route 10 / Interstate 90 from Ritzville to Spokane This route followed State Route 6 from Chehalis to Raymond, and U.S. Route 101 from Raymond to Johnsons Landing, and State Route 4 from Johnsons Landing to Kelso. This route followed U.S. Route 101 in Washington from Aberdeen to Raymond. This route followed State Route 16 from Hoodsport to Tacoma This route followed U.S. Route 2 from Everett to Peshastin This route followed State Route 20 from Fredonia to Pateros , and State Route 153 from Pateros to Twisp The route followed

1749-535: The cities of Issaquah and Seattle to the west and North Bend and Spokane to the east, traveling over the Cascade Mountains through Snoqualmie Pass . The roadway continues past the interchange as Snoqualmie Parkway into the city of Snoqualmie , intersecting SR 202 . Every year, the Washington State Department of Transportation (WSDOT) conducts a series of surveys on its highways in

1802-619: The cities of the Central Valley , Route 128 in Massachusetts, or parts of Route 101 in New Hampshire). Each state has its own system for numbering and its own marker. The default marker is a white circle containing a black sans serif number (often inscribed in a black square or slightly rounded square), according to the Manual on Uniform Traffic Control Devices (MUTCD). However each state

1855-507: The completion of a more direct alignment through the Issaquah Alps between Issaquah and North Bend . Prior to the construction of the first floating bridge across Lake Washington in 1940, the route from Seattle to Issaquah followed what would later become SR 900 . This route followed Interstate 82 from Ellensburg to the Oregon State line (concurrent with U.S. Route 97 from Ellensburg to Union Gap and U.S. Route 410/12 from Union Gap to

1908-531: The main cities; in 1865 the Lanza law introduced the classification of roads between national, provincial and municipal (see Annex F, art.10) and the Royal Decree of 17 November 1865, n. 2633 listed the first 38 national roads. Italian state highways are identified by a number and a name. In road signs and maps the number is preceded by the acronym SS, an acronym for strada statale ("state road"). The nomenclature of

1961-500: The mixed-use Interurban Trail as it approaches a folded cloverleaf interchange with C Street Southwest and a partial cloverleaf interchange with SR 164 at Auburn Way. The freeway then crosses over the Green River into unincorporated King County . SR 18 continues northeast along the southeastern city limits of Kent , through an interchange with Southeast 304th Street, which serves Green River College , towards Covington . The freeway intersects SR 516 in

2014-477: The next important roads under the National highways . The number has two, three, or four digits. Highways with two-digit numbers routes are called State-funded local highways. State roads ( Turkish : Devlet yolu ) are primary roads, mostly under the responsibility of General Directorate of Highways (KGM) except in metropolitan city centers where the responsibility falls into the local government. The roads have

2067-491: The primary and secondary split remained, and several roads remained named only. The United States Numbered Highways were assigned in late 1926, overlapping some of the State Roads. The first major reworking of the system was passed in 1937, including a complete renumbering. A number of Primary State Highways were designated, while Secondary State Highways were suffixed spurs off those. For instance, Primary State Highway 1

2120-489: The remaining section of SR 18, between Issaquah-Hobart Road south of Tiger Mountain to I-90 near Snoqualmie, to four lanes with a median barrier to separate opposing lanes of traffic and prevent head-on collisions. The western section will include a right-in/right-out interchange at the Tiger Mountain summit; $ 640 million was approved in the 2022 Move Ahead Washington transportation package. The I-90 interchange

2173-747: The route of U.S. Route 10 (now Interstate 90 ) from George to Ritzville The provisional designation of a proposed outer bypass of the Seattle metropolitan area between Auburn and Bothell , also known unofficially as Interstate 605 . The route followed present-day State Route 104 from the Kingston Ferry to the Hood Canal Bridge , then State Route 3 from the Hood Canal Bridge to Belfair , then State Route 106 from Belfair to Skokomish The route followed present-day Washington State Route 25 . State highways Roads maintained by

List of Primary State Highways in Washington - Misplaced Pages Continue

2226-519: The route of U.S. Route 99 (replaced by Interstate 5 ) from Vancouver to Blaine. It also served U.S. Route 99 Alternate (now SR 11 ) in Skagit and Whatcom counties. PSH 2 originally followed the Sunset Highway, which was the first continuous east–west highway in Washington when it was designated in 1915. The Sunset Highway was numbered as State Road 2 in 1923 and later PSH 2 in 1937. Its route

2279-494: The site of over 170 accidents in the 1980s. SR 18 was gradually widened into a four-lane freeway beginning in Auburn in 1992 and most recently finishing in Federal Way in 2007. The highway around Tiger Mountain and near the I-90 interchange remains a two-lane road, with a funded project planned to re-build the existing interchange with I-90. SR 18 begins as South 348th Street at a signalized intersection with SR 99 , named

2332-636: The south. SR 18 becomes a full four-lane freeway as it descends into Peasley Canyon east of a diamond interchange with Weyerhaeuser Way, located south of the Weyerhaeuser headquarters. After exiting the canyon, the freeway enters the city of Auburn and intersects West Valley Highway, signed as SR 181 until 1991, and SR 167 , named the Valley Freeway, in a complex hybrid partial cloverleaf and diamond interchange. SR 18 continues east past The Outlet Collection Seattle and over

2385-631: The state highways managed by ANAS generally follows the SS n scheme, where n is a number ranging from 1 ( Aurelia ) up to 700 (of the Royal Palace of Caserta ) depending on the date of establishment of the state highway. Newly built ANAS roads, not yet classified, are identified by the acronym NSA, an acronym for nuova strada ANAS ("new ANAS road"). State highways can be technically defined as main extra-urban roads (type B road) or as secondary extra-urban roads (type C road). State highways that cross towns with

2438-431: The state to measure traffic volume. This is expressed in terms of annual average daily traffic (AADT), which is a measure of traffic volume for any average day of the year. In 2012, WSDOT calculated that the busiest section of SR 18 was its interchange with SR 167 in Auburn, serving 97,000 vehicles, while the least busiest section of the highway was its eastern terminus at I-90, serving 19,000 vehicles. SR 18

2491-518: The word "state" in this sense means "government" or "public" (as in state housing and state schools ), not a division of a country. New Zealand's state highway system is a nationwide network of roads covering the North Island and the South Island . As of 2006, just under 100 roads have a "State Highway" designation. The NZ Transport Agency administers them. The speed limit for most state highways

2544-458: Was adopted by U.S. Route 10 in 1926 (replaced by Interstate 90 ) from Seattle to near Ellensburg, then U.S. Route 97 to Peshastin , then U.S. Route 2 to Spokane, then US 10/I-90 from Spokane to the Idaho state line. A southern branch of PSH 2 followed the route of Washington State Route 18 from Snoqualmie to Tacoma . The highway originally traveled through Fall City and Snoqualmie until

2597-432: Was also known as the "Inland Empire Highway" and crossed the first, and for a time, the only highway bridge over the middle Columbia River. That bridge was located between the towns of Kennewick, WA and Pasco, WA. This route followed State Route 30 (now part of State Route 20 ) from Tonasket to Republic and State Route 21 from Republic to Wilbur . PSH 5 began at PSH 2 in Seattle and traveled south along

2650-522: Was completed in 1997 from the Green River to Southeast 304th Street in Covington , and in 2007 from Covington through Maple Valley and to Issaquah-Hobart Road. The western end of the freeway was extended in Federal Way through Peasley Canyon to I-5 in Federal Way, which was further improved in 2011 with the completion of interchange improvements to the "Federal Way Triangle". WSDOT is planning to widen

2703-592: Was established during the 1964 state highway renumbering as the successor to the Auburn–Federal Way branch of Primary State Highway 5 (PSH 5) and the Auburn–North Bend branch of PSH 2 , which were created in 1931 and 1949, respectively. The initial two-lane highway, named the Echo Lake Cutoff , was completed in December 1964 after the opening of a section around Tiger Mountain, which would later be

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2756-497: Was established in 1905, and a set of twelve State Roads , numbered from 1 to 12, were assigned. A thirteenth was added in 1907, and State Roads 14 to 18 in 1909. However, it was not until 1913 that a connected system was laid out—earlier state roads had been disconnected segments of road needing improvements. The seven primary roads were only assigned names, while the older state roads kept their numbers as secondary roads . In 1923, most state roads were assigned new numbers, though

2809-465: Was the Pacific Highway (present Interstate 5 ), and Secondary State Highway 1B was a spur from Bellingham to the Canadian border (now State Route 539 ). U.S. Routes kept dual designations with State Highways. By 1952, the present highway shield, in the shape of George Washington 's head, had been adopted. The primary/secondary state highway systems were replaced by the current numbering system in

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