If you somehow missed our multiple posts on the topic, consider this your final warning: for the first time in its history, the Golden Gate Bridge is closing to cars for an entire weekend, starting tonight.

The shut-down begins at 11:59 p.m. tonight (Friday, January 9) and you won't be able to drive a car across the span until 4 a.m. Monday, January 12, as construction crews install that new movable median system we told you all about in this post right here.

11:59? you might be asking? That's a whole minute earlier than I expected! Well, the California Highway Patrol changed it to 11:59 p.m. "to eliminate any possible confusion," they said, which I am reading as "we don't want dummies to have any excuse to try to drive across this thing."

And even before the main event, CHP's going to start closing down the roads leading to the bridge. Here's the plan:

• 8:00 a.m.: Southbound Hwy 101 off-ramp at Rodeo Avenue
• At 8:00 p.m.: Parking lots at the north end of Bridge, and Alexander Avenue at Conzelman
• 11:30 p.m.: Southbound Hwy 101 at Marin City, the Southbound Hwy 101 on-ramps at Spencer Avenue and at Alexander Avenue, the Northbound Hwy 101 on-ramp at Alexander Avenue, and the parking lots at south end of the Bridge
• 11:30 p.m.: Northbound Hwy 101 at Marina Boulevard & Richardson Avenue, and Northbound Hwy 1 at Lake Street
• 11:45 p.m.: Northbound Hwy 101 off-ramp at Merchant Road and Southbound Hwy 101 off-ramp at Merchant Road

People are still allowed to bike or walk across the bridge using the east sidewalk, and Golden Gate Ferry and Blue and Gold Fleet will be running extra vessels to get folks who need it to and from Marin to SF. Golden Gate Transit buses will also continue to run across the bridge, but expect delays: Golden Gate Bridge spokesperson Priya Clemens tells the Chron "they’ll be escorted through construction zones when activity permits — which could mean some waiting to cross the bridge."

And of course, drivers can also detour around the GGB via the Richmond-San Rafael Bridge, but don't expect it to be an easy trip. According to Clemens, 80,000 cars typically cross the GGB on Saturdays and Sundays, and 60,000 do the same on the Richmond-San Rafael. So if all 80K of GGB regulars head to the Richmond bridge, a shitshow's sure to ensue.

That's why, officials say, it might make more sense to stay in this weekend. “Stay at home...shop locally, eat locally,” Clemens says.

But what about, like, this poor couple, which planned a wedding in SF and a reception in Sausalito this weekend? They're out of luck, Clemens tells ABC7.

"Someone is trying to get to a marathon, a special dinner, they are pregnant," Clemens says.

"We tell them we are really sorry. We would love to help you out. It's emergency vehicles and Golden Gate Transit buses only this weekend."

Previously: Video: Here's How The Golden Gate Bridge's New Movable Median Will Look
Reminder: Golden Gate Bridge Closed To Traffic This Weekend To Get New Median

We've been telling you about the Golden Gate Bridge's new movable median for ages, and now the time for its installation has come — and with that, a weekend-long closure of the span, the first such shutdown in its history.

As we discussed way back in March, the $26.5 million, 11,538-foot-long steel and concrete median will replace the current system of bendy, yellow, plastic tubes. The new system will have a "zipper truck" system to move the 800 separate 1,500 pound pieces of the barrier into the proper lane configurations, all to better prevent head-on collisions. And now we have an idea of how that's going to look, per a video released by the Golden Gate Bridge Highway and Transportation District just a few days ago.

According to the GGB Highway and Transportation District, after the barrier's installed we're in for a "new driving experience," which includes a lower speed limit and much narrower lanes.

The barrier will be installed on the 1.7-mile-long Bridge and on the approach portion of Highway 101, north of the Golden Gate Bridge, starting at Alexander Avenue. Using transfer machines, the barrier will be moved several times a day to create more lanes in a particular direction to accommodate variable traffic demands such as the morning and evening commutes.

A new merge will be very different for southbound vehicles. Where drivers current merge from left to right, the new merge will be from right to left. In addition, the speed limit will be dropped to 45 miles per hour from the current 55 miles per hour on the decent down the Waldo Grade. Lastly, with the installation of the barrier, the two inside lanes will lose 6-inches of width. Getting used to driving next to the barrier may take some adjustment for some drivers, and the District advises motorists to take it slow and get used to the new driving conditions.

To put all this in place, the bridge will close at 12:01 a.m. on Saturday, January 10 and is expected to reopen on Monday, January 12, at 4 a.m., in the first and longest closure of the Bridge's existence.

"The bridge has been closed only for weather, namely high winds," the Marin IJ reported earlier this year, "but never for much more than three hours, bridge officials said. In 1987 it was closed to vehicle traffic for the span's 50th birthday, but was open to pedestrians."

According to GGB officials, "Golden Gate Transit bus service will be allowed to cross the Bridge," but everyone else is out of luck. So, if you need to get to the North Bay (or beyond) the weekend of 1/10, you'll need to take a bus, Golden Gate Ferry (which "will be offering expanded service that weekend, including late night service") or the Richmond and Bay Bridges. Good luck!