The people in charge of traffic in the city of San Francisco are warning drivers that this will be a challenging day to navigate the streets of San Francisco.
Some 20,000 runners are making their way through the City Sunday as they complete a 26.2 mile tour.
Another 100,000 are supposed to be out there watching them. The race starts and ends along the Embarcadero with the route going across the Golden Gate Bridge and into Golden Gate Park at one point or another.
Here is the 411 from the SFMTA:
On Sunday the annual San Francisco Marathon will begin from The Embarcadero and Mission at 5:30 a.m., with staggered starts until 6:30 a.m. The race route will loop north along The Embarcadero, through the Presidio, the outer Richmond District, Golden Gate Park, the Haight, the Mission District, Inner Bayview and back to The Embarcadero. An attendance of up to 20,000 runners is expected.
From midnight, Saturday to 2:30 p.m., Sunday, the following street closures are required:
Various additional street closures will be required between 5 a.m. to 12:15 p.m. throughout the race route including in the Presidio and Golden Gate Park. A detailed list with suggested detours can be found at www.thesfmarathon.com.
The following Muni routes and lines will be affected:
F Market K Ingleside L Taraval
M Ocean View N Judah T Third
1 California 2 Clement 5 Fulton
6 Parnassus 9 San Bruno 10 Townsend
12 Folsom/Pacific 14/14L Mission 14L Mission Limited
19 Polk 22 Fillmore 24 Divisadero
27 Bryant 28 19th Avenue 29 Sunset
31 Balboa 33 Stanyan 37 Corbett
38 Geary 39 Coit 43 Masonic
44 O’Shaughnessy 47 Van Ness 48 Quintara
49 Van Ness 71 Haight/Noriega 76 Marin Headlands