One hundred percent of tree material removed during the preconstruction activity was recycled or salvaged by Green Waste Recycle Yard in Richmond, California.
More than 50 native plant species, for a total of 45,000 plants, were collected in the Presidio prior to construction and are now being grown in the Presidio Nursery.
Many of the piles for the high viaduct will be 12 feet in diameter, requiring a special oscillator rig for installation of the piles. Larger, deeper piles mean fewer piles are necessary, opening views from the Presidio to the bay.
The new parkway will allow pedestrians and bicyclists to cross over or under Doyle Drive in accordance with the Presidio Trails and Bikeways Master Plan.
The new parkway will have larger 11- and 12-foot lanes to accommodate buses and provide an improved experience for drivers.
Each weekday, nearly 120,000 vehicles travel between Marin and San Francisco over the Golden Gate Bridge along Doyle Drive.
The start of construction of the Presidio Parkway was accelerated by more than a year thanks to the receipt of $50 million in federal stimulus funding.
The new parkway will improve traffic safety by including continuous shoulders for emergency and disabled vehicles.
The first set of tunnels, the Battery Tunnels, will be constructed north of the San Francisco National Cemetery and span 853 feet.
Halleck Street will be closed and temporarily removed during construction. Upon completion of the Main Post Tunnels, Halleck Street will be restored over the top of the new tunnels.
The Main Post Tunnels will be constructed north of the Main Post parade grounds. These will be the longer of the two sets of tunnels, spanning 1,017 feet.
$3.6 million went directly to small and local businesses for the project’s first preconstruction contract (tree removal and native plant and seed collection).
The new parkway will include extended bus bays on both sides of Richardson Avenue.
Seismic safety will be achieved in 2011 when traffic is transferred onto new structures and the temporary bypass adjacent to the existing facility.
A robust Disadvantaged and Small Business Enterprise Participation Program has been established to actively engage businesses throughout San Francisco, the Bay Area, and California to participate in the project.
The northbound and southbound roadways will be separated by a wide, landscaped median improving driver safety and creating a parkway feel.
Both sets of tunnels will be constructed using the cut and cover method by digging into the natural bluffs and covering the tunnels with a green pedestrian corridor.
Including a temporary bypass in the construction phasing reduced the construction duration by nearly two years.
Concrete is used more than any other man-made material in the world

Doyle Drive Weekend Closure
Because sometimes the fastest way to open is to close!

April 27-30 8 p.m. Friday to 5 a.m. Monday	12 days 17 hrs 08 mins 43 secs	Add to your site!

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During the closure, motorists are asked to avoid the construction area whenever possible and choose alternate routes or modes of transportation. See detour routes for the closure weekend.

Closure Quick Facts	New Driving Condition Quick Facts
Date: April 27-30, 8pm Friday to 5am Monday Golden Gate Bridge to Hwy 1 will remain open, however, expect major delays No access to Hwy 101 from Marina Blvd./Richardson Ave. The public is encouraged to use buses, ferries, alternate routes or choose car-free activities Drivers should avoid the closure area	The temporary driving condition will: Move traffic onto the new southbound tunnel, bridge and a temporary bypass Be in effect from Spring 2012-2015 (project completion) Meet today's seismic safety standards Improve traffic safety and prevent head-on collisions Have five lanes with a moveable median barrier Take some time for drivers to get used to! Expect delays as drivers adjust

Weekend Closure Overview

Doyle Drive will be closed April 27-30...because sometimes the fastest way to open is to close! This closure allows traffic to be shifted off Doyle Drive and onto a temporary, seismically safe roadway while the existing Doyle Drive is removed and the rest of the Presidio Parkway is built. The project has been carefully planned to keep traffic moving during the full roadway replacement and to avoid on-going closures of Doyle Drive. After the weekend closure and shift, traffic will flow adjacent to the existing Doyle Drive on the completed Phase I structures (southbound bridge and tunnel) and the temporary bypass through the end of the project. Opposing traffic will be separated by a moveable median barrier. Please expect delays as drivers adjust to the new condition.

For more information, see the Weekend Closure Fact Sheet

Doyle Drive Weekend Closure Because sometimes the fastest way to open is to close!

April 27-30

VIDEO! Drive southbound on the temporary condition (Spring 2012-2015)

Weekend Closure Overview

Doyle Drive Weekend Closure
Because sometimes the fastest way to open is to close!