Ok… Lets start with the bridges… Golden Gate Bridge turns 75 and the bridge will be closed on Sunday between i believe 6-10pm.
Dumbarton Bridge (Hwy 84) will be closed until Tuesday morning at 9:30am unless work finishes early.
Then, within San Francisco, Muni is going to be shutting down several lines including the N Judah which is the busiest transit line in the MUNI system. Along with the N, the J Church will be closed (except from Market to Embarcadero), the 22 Fillmore and the N owl will be rerouted until June 4th. (that is 9 yes NINE days!).
So, needless to say, the traffic in and around the bay this weekend is going to be HORRIBLE!!
If you are planning a trip into SF to join in the festivities of the 75th birthday party, i HIGHLY recommend that you take cal train, bart or ride your bike into the city. Because i live on the opposite side of the city, the traffic is going to be so bad that i think that i will just watch the fireworks from the top of Bernal Hill if fog (lack there of) permits.
Also, if you come into town, come in early, plan to spend the day, and BRING SUNBLOCK!!
Happy travel on this Memorial Day Weekend!