Roads are rated from 1 to 100 in terms of their ability to withstand earthquakes. 100 is very good. Doyle Drive, which cuts across the Presidio like a fortress wall and connects Highway 101/Lombard Street to the Golden Gate Bridge, rates a 2.

After years of study and planning, a preferred replacement alternative was selected. Sometimes the system works: the preferred alternative was hands down the best option, not only creating a seismically safe road in place of Doyle Drive, but creating a beautiful roadway that undulates through the Presidio and creates new walking paths and bike trails and seven additional ways to cross the road, connecting people to the park.