The people in charge of traffic in the city of San Francisco are warning drivers that this will be a challenging weekend to navigate the streets of the city by the Bay.
The highlights are a Critical Mass bike ride on Friday and a marathon on Sunday.
Here is the 411 from the SFMTA:
The San Francisco Municipal Transportation Agency (SFMTA) advises San Francisco residents and visitors of the following event-related traffic and service impacts this weekend, Friday, July 29 through Sunday, July 31. Event participants and fun seekers should check with www.sfmta.com or call 311 to find out which of the 80 Muni lines will get them where they want to go.
On Friday the monthly Critical Mass bicycle ride will leave from Justin Herman Plaza sometime after 6 p.m.
Motorists and transit riders may be delayed as the bicycle ride passes. Roads will re-open as soon as bicyclists have passed.
Visitacion Valley Library Grand Opening
On Saturday a grand opening celebration for the new Visitacion Valley Branch Library will take place at 201 Leland Avenue. Festivities begin at 1 p.m. and library services start at 2 p.m.
Leland Avenue between Rutland and Cora streets will be closed between 11 a.m. and 3:30 p.m.
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
Up Your Alley Fair
The Up Your Alley Street Fair will be held on Sunday from 11 a.m. to 6 p.m.
The following street closures will be required from 5 a.m. to 9 p.m., Sunday.
The following Muni routes will be affected.