seattle metro bus tunnel

Seattle’s Underground Bus System: The Downtown Seattle Transit Tunnel

The Downtown Seattle Transit Tunnel (DSTT) is a 1.3-mile-long tunnel providing a dedicated right-of-way for buses and light rail in downtown Seattle. Initially built for buses in 1990, it now serves both King County Metro buses and Link light rail, offering a quicker and more reliable commute for thousands of passengers daily.

History and Purpose

Before the tunnel, buses struggled through congested downtown streets. The DSTT was conceived to improve transit efficiency by separating buses from surface traffic. Construction began in the late 1980s, and the tunnel opened in 1990, initially exclusively for buses. As Seattle grew, the need for light rail became apparent, and the tunnel was adapted to accommodate both buses and light rail, officially opening to light rail service in 2009.

Tunnel Design and Operation

The tunnel runs beneath Third Avenue in downtown Seattle and has five stations: Westlake, University Street, Pioneer Square, International District/Chinatown, and Stadium. During peak hours, buses and light rail share the tunnel. Bus routes that operate in the tunnel typically serve areas south of downtown Seattle. The tunnel’s ventilation system is critical to maintaining air quality, especially when buses are operating in the tunnel.

Conversion to Light Rail

The conversion process to accommodate light rail was a major undertaking. It involved lowering the tunnel floor, widening platforms, installing tracks, and upgrading the electrical and ventilation systems. This change significantly enhanced the tunnel’s capacity, making it an integral part of the Link light rail network. More details about the tunnel can be found on Wikipedia.

Current Usage and Impact

The DSTT is a vital transportation artery for Seattle. It handles a large volume of commuters each day, easing congestion on surface streets and providing faster transit times. The tunnel has significantly impacted the accessibility of downtown Seattle, making it easier for people to live, work, and visit the city center.

Future Developments

With ongoing expansions to the Link light rail system, the DSTT’s role as a key transit hub will only grow. As Seattle continues to develop, the tunnel will remain a crucial component of the region’s transportation infrastructure.

FAQs

Why was the Seattle bus tunnel built?

The tunnel was built to alleviate traffic congestion in downtown Seattle and improve the efficiency of public transportation by separating buses from surface street traffic.

When did the Seattle bus tunnel open?

The tunnel originally opened in 1990, exclusively for buses.

Does the Seattle bus tunnel still have buses?

Yes, King County Metro buses still use the tunnel, sharing it with Link light rail.

How long is the Downtown Seattle Transit Tunnel?

The tunnel is approximately 1.3 miles long.

How many stations are in the Seattle bus tunnel?

There are five stations located within the tunnel: Westlake, University Street, Pioneer Square, International District/Chinatown, and Stadium.

Summary

The Downtown Seattle Transit Tunnel is a crucial piece of Seattle’s public transportation infrastructure. Originally designed for buses, it now accommodates both buses and light rail, enhancing commute times and easing downtown congestion. Its continued importance will grow as the city’s light rail network expands.