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- The Downtown Seattle Transit Tunnel (DSTT), also referred to as the Metro Bus Tunnel, is a 1.3-mile-long (2.1 km) pair of public transit tunnels in Seattle, Washington, United States. The double-track tunnel and its four stations serve Link light rail trains on Line 1 as it travels through Downtown Seattle. It runs west under Pine Street from 9th Avenue to 3rd Avenue, and south under 3rd Avenue to South Jackson Street. Line 1 trains continue north from the tunnel to Northgate station and south through the Rainier Valley past Seattle–Tacoma International Airport to Angle Lake station as part of Sound Transit's light rail network. The DSTT was used only by buses from its opening in 1990 until 2005, and shared by buses and light rail from 2009 until 2019. Bus routes from King County Metro and Sound Transit Express left the tunnel north via Interstate 5, south via the SODO Busway, or east via Interstate 90. It was owned by King County Metro and shared with Sound Transit through a joint-operating agreement signed in 2002; Sound Transit assumed full ownership in 2022. The Downtown Seattle Transit Tunnel was one of two tunnels in the United States shared by buses and trains, the other being the Mount Washington Transit Tunnel in Pittsburgh, and was the only one in the United States with shared stations. Though proposals for a rapid transit tunnel under 3rd Avenue were introduced in the 1910s and 1920s, planning for the modern bus and rail Metro Bus Tunnel only began in 1974. The King County Metro Council approved the bus tunnel proposal in November 1983, but construction did not begin until March 1987. The tunnel between Convention Place and Westlake stations was built using the cut-and-cover method, closing Pine Street for 19 months and disrupting access to the retail core. The segment from Westlake to the International District was bored with two tunnel-boring machines, heading north from Union Station and finishing within a month of each other. Tests of normal buses and the Breda dual-mode buses built specifically for tunnel routes began in March 1989; tunnel construction was declared complete in June 1990, at a cost of $469 million. Light rail tracks were installed in anticipation of future rapid transit service through the tunnel, but were later found to be poorly insulated and unusable for Link light rail. Soft openings and public previews of the five tunnel stations were held from August 1989 to September 1990, with regular bus service beginning on September 15, carrying 28,000 daily passengers in its first year of operation. For the next several years, until June 2004, service in the tunnel was provided exclusively by dual-mode buses, which ran as trolleybuses in the tunnel – like the city's extensive trolleybus system – and as diesel buses on surface streets and freeways. The tunnel was closed on September 24, 2005, for modification to accommodate both buses and Sound Transit's Central Link (now Line 1) light rail trains with shared lanes and platforms. The roadway was lowered by 8 inches (20 cm) and other improvements were made to prepare for light rail service. New hybrid electric buses were moved into the tunnel to replace the Breda fleet, as the overhead wire was replaced for light rail trains. The tunnel reopened on September 24, 2007, and light rail service began on July 18, 2009. A stub tunnel, branching from the main tunnel, was constructed under Pine Street to allow light rail trains to stop and reverse direction; it was later used as the first segment of a light rail extension to Capitol Hill and the University of Washington that opened in 2016. Convention Place station was closed permanently on July 21, 2018, to make way for an expansion of the Washington State Convention Center that would also restrict bus access to the tunnel. On March 23, 2019, bus service in the tunnel ceased and its remaining seven routes were moved to surface streets. (en)
- El Downtown Seattle Transit Tunnel (DSTT), también conocido como el Metro Bus Tunnel, es un 1,3 millas (2,1 km) par de túneles para transporte público que funciona de norte–sur bajo la Tercera Avenida sobre el , Washington desde la Novena Avenida y Pike Street a la Quinta Avenida Sur a South Jackson Street. El túnel de doble vía y sus estaciones, con la excepción de Convention Place, constituyen la estación meridional de la Central Link del Tren Ligero de Seattle, continuando al sur por al Aeropuerto Internacional de Seattle–Tacoma como parte de la red del Tren Ligero de Seattle operado por Sound Transit. Todas sus cinco estaciones son servidas por autobuses de King County Metro y que salen del túnel al norte vía la , al sur vía , o al este vía la Interestatal 90. La DSTT es la sección más ocupada de la red del Tren Ligero de Seattle, con un promedio de 10,000 pasajeros al día. Es propiedad de King County Metro y compartido con Sound Transit, al haber hecho un acuerdo en conjunto para operar, cuando el condado de King tomo cargo en 2002. El Downtown Seattle Transit Tunnel es uno de dos túneles de autobuses y trenes en los Estados Unidos, junto con el en Pittsburgh, Pensilvania, pero sin ninguna estación. (es)
- Il Downtown Seattle Transit Tunnel, o Metro Bus Tunnel, è un tunnel di transito lungo 2,1 km (1,3 mi) situato sotto Downtown Seattle, dalla 9th Avenue e Pike Street, fino alla 5th Avenue S. e S.Jackson Street. Approvato dalla Metro Transit nel 1983, la costruzione iniziò nel 1987. Venne completata ed entrò in esercizio nel 1990 per un costo totale di $ 455 milioni. Nel maggio del 2000 il consiglio comunale trasferì la proprietà alla Sound Transit ma la proprietà, nel 2002, venne ritrasferita nuovamente alla King County Metro. Il tunnel venne chiuso il 24 settembre del 2005 per consentire l'utilizzo congiunto, sia con la linea della metropolitana leggera Central Link, che degli autobus. Prima della chiusura il tunnel era utilizzato da circa dodici linee di autobus a doppia alimentazione, e all'interno del tunnel utilizzavano il motore elettrico come i filobus, e il motore diesel nelle strade cittadine. Il tunnel venne riaperto il 24 settembre del 2007. Inoltre, venne costruito un tunnel più piccolo, che si diramava dal tunnel principale, sotto Pine Street, tra la 7th Street e Boren Avenues, per consentire ai treni, sia di fermarsi ed invertire il senso di marcia, che per future estensioni della Central Link. A causa della conversione per il Central Link, i filobus non possono più accedere al tunnel. Questi autobus sono già stati sostituiti dalla nuova flotta di veicoli ibridi della King County Metro. Mentre quegli autobus producevano molte più emissioni rispetto ai filobus standard, i nuovi producono molte meno emissioni rispetto agli standard degli autobus a motore diesel e non hanno bisogno di un collegamento alla rete elettrica. Da quando il pavimento del tunnel venne abbassato per consentire il passaggio della ferrovia leggera, sono nate delle preoccupazioni sul fatto che gli specchietti degli autobus si trovino all'altezza della testa delle persone con il rischio che potrebbero colpire coloro che sono in attesa sulle piattaforme. Per evitare questo, gli specchi vennero dotati di luci intermittenti. Allo stesso tempo la velocità di ingresso e di uscita dalle stazioni fu ridotta da 24 km/h a 16 km/h. Il tunnel è situato interamente nell'area Ride free, quindi non viene applicato nessun costo hanno agli autobus in tutte le cinque fermate durante le ore in cui è attivo il servizio gratuito. A causa della differente politica della Sound Transit, sul Central Link è richiesto il biglietto. (it)
- 西雅圖市中心公交隧道（英語：Downtown Seattle Transit Tunnel）是美国华盛顿州西雅图市中心地底的一条公共運輸隧道，全長1.3英里（2.1公里），北起第九大道（9th Avenue）和派克街（Pike Street），南至第五大道南（5th Avenue S.）和傑克遜街南（S. Jackson Street）。隧道開通時只供金縣大都會運輸局的巴士行駛，是世界上第一條投入營運的全封閉地下快速公交系統（BRT）；自2009年起隧道亦供海湾公共交通局旗下的中央線輕軌（Central Link）行駛。 (zh)
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- 西雅圖市中心公交隧道（英語：Downtown Seattle Transit Tunnel）是美国华盛顿州西雅图市中心地底的一条公共運輸隧道，全長1.3英里（2.1公里），北起第九大道（9th Avenue）和派克街（Pike Street），南至第五大道南（5th Avenue S.）和傑克遜街南（S. Jackson Street）。隧道開通時只供金縣大都會運輸局的巴士行駛，是世界上第一條投入營運的全封閉地下快速公交系統（BRT）；自2009年起隧道亦供海湾公共交通局旗下的中央線輕軌（Central Link）行駛。 (zh)
- The Downtown Seattle Transit Tunnel (DSTT), also referred to as the Metro Bus Tunnel, is a 1.3-mile-long (2.1 km) pair of public transit tunnels in Seattle, Washington, United States. The double-track tunnel and its four stations serve Link light rail trains on Line 1 as it travels through Downtown Seattle. It runs west under Pine Street from 9th Avenue to 3rd Avenue, and south under 3rd Avenue to South Jackson Street. Line 1 trains continue north from the tunnel to Northgate station and south through the Rainier Valley past Seattle–Tacoma International Airport to Angle Lake station as part of Sound Transit's light rail network. (en)
- El Downtown Seattle Transit Tunnel (DSTT), también conocido como el Metro Bus Tunnel, es un 1,3 millas (2,1 km) par de túneles para transporte público que funciona de norte–sur bajo la Tercera Avenida sobre el , Washington desde la Novena Avenida y Pike Street a la Quinta Avenida Sur a South Jackson Street. El túnel de doble vía y sus estaciones, con la excepción de Convention Place, constituyen la estación meridional de la Central Link del Tren Ligero de Seattle, continuando al sur por al Aeropuerto Internacional de Seattle–Tacoma como parte de la red del Tren Ligero de Seattle operado por Sound Transit. Todas sus cinco estaciones son servidas por autobuses de King County Metro y que salen del túnel al norte vía la , al sur vía , o al este vía la Interestatal 90. La DSTT es la sección m (es)
- Il Downtown Seattle Transit Tunnel, o Metro Bus Tunnel, è un tunnel di transito lungo 2,1 km (1,3 mi) situato sotto Downtown Seattle, dalla 9th Avenue e Pike Street, fino alla 5th Avenue S. e S.Jackson Street. Approvato dalla Metro Transit nel 1983, la costruzione iniziò nel 1987. Venne completata ed entrò in esercizio nel 1990 per un costo totale di $ 455 milioni. Nel maggio del 2000 il consiglio comunale trasferì la proprietà alla Sound Transit ma la proprietà, nel 2002, venne ritrasferita nuovamente alla King County Metro. (it)
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