thumb|left|An aerial view of the Presidio As the Doyle Drive viaduct was deemed seismically unsafe and obsolete, construction started on the demolition of Doyle Drive in 2008 to replace the structure with a flat, broad-lane highway with a tunnel through the bluffs above Crissy Field, called the Presidio Parkway. The project cost $1 billion and was scheduled to be completed by 2016.
thumb|left|An aerial view of the Presidio As the Doyle Drive viaduct was deemed seismically unsafe and obsolete construction started on the demolition of Doyle Drive in 2008 to replace the structure with a flat broad-lane highway with a tunnel through the bluffs above Crissy Field called the Presidio Parkway The project cost $1 billion and was scheduled to be completed by 2016