Two major weekend road closures in San Francisco, North Bay

happening in the Bay Area. They're going to have an impact on anyone planning to drive to San Francisco as well as drivers in the North Bay. KTVU's Devin Truby is live with the advice on the detours to take. Devin, good morning. Good morning, Andre. That advice is going to be to take public transportation and get a good look at these detours in advance as this will be impacting a lot of people during their weekend travel. Two major closures lasting the entire weekend. So we're talking about 55 hours in total for both of these. Let's get into it. We'll show you the first one. This is going to impact the westbound lanes of I-80. This is going to be from 5th to 15th Street. This all starts Friday night at 11 p.m., extending until Monday at 6 a.m. Caltrans is advising residents not to use the Bay Bridge, but rather public transportation and the other bridges to get into the city. The work is to complete the concrete on the freeway decks earlier this year they did the eastbound side. Oh definitely avoid the area. If it's work that need to be done then you know they got to do it. I appreciate it being done. The second closure impacts State Route 37 and this 55-hour closure will involve the east and westbound lanes from Mare Island and Vallejo to Sears Point. The median will be taken out so all the flow of traffic in both directions will be using the westbound lanes. Now this work is to prepare for the upcoming El Nino, where they're going to be raising portions of the road three feet to address flooding concerns for those big rains and tides. Now, this all starts 10 p.m. tonight and goes until Monday at 5 a.m. The suggested alternative route for this one, if you are westbound, use State Route 121. Excuse me, if you're eastbound, use State Route 121. If you are westbound, you're going to do that big loop over the top. That's 29 to get you to 12, and then 12 to drop you down to 121 just past the Sonoma Raceway. So look at public transportation options. Look at the detours in advance so you can budget the extra time that you'll most likely need to get around the detours. But also think about all that residual traffic being pushed on routes people normally don't take because of these closures. Reporting live, Devin Truby, KTVU, Fox 2 News. Devin, thank you.