How do I know? I was just nabbed by a CHP officer with a hand-held radar gun, standing next to her car at the end of the S-curve, at the point where the S-curve roadway rejoins the old roadway just before the tunnel.

So resist the temptation to accelerate when you get to the end of the S-curve, folks, unless you want to spend the rest of your trip across the Bay Bridge with a CHP car on your tail and everyone else laughing at you.

KTVU-TV story: CHP launches crackdown on speeders at S-curve

The truck hit the curve at 50 m.p.h., which is the speed limit for much of the bridge, but not for the S-curve, a temporary detour installed over the Labor Day weekend as part of the decade-long Bay Bridge earthquake retrofit project. After a big rig crashed on the curve Oct. 14, spilling cargo across four lanes, CalTrans lowered the speed limit on the curve to 35 m.p.h. and installed new signs, but evidently they weren’t enough to draw the attention of a sleepy produce truck driver in the middle of the night.

The driver was killed when the truck went over the guardrail and plunged 200 feet to the ground on the shore of Yerba Buena Island.

Quoted in the SFGate.com story, a CalTrans spokesman blamed the driver, saying the crash was “another example of poor judgment.”

A reel of “raw video” on the KPIX website shows the impact scene before dawn, including a grotesque image of the driver’s severed forearm and hand.

Pictures show an eerily empty toll plaza, an eerily empty bridge, and stuffed BART trains. Meanwhile, a car thief blew through barricades in San Francisco and led police on a chase over the closed bridge, and most people in San Francisco today completely forgot there was any problem at all, since it’s a gorgeous, sunny, warm 1st of November.

You can text the word ALERT to 45227 (which is KCBS radio) and get a text message when the Bay Bridge reopens.

Update, 3:20 pm: The 511.org site now says the bridge will be closed “through Friday,” but “if” the bridge remains closed, BART will run hourly all-night service to the East Bay tonight and Saturday night. Here’s the all-night BART details. Note that only 14 stations will be in operation overnight.

Meanwhile, a UC Berkeley engineering expert was being quoted in news reports saying the design of the first fix — which was done while crews were cleaning up from the mammoth Labor Day re-route — was “not correct” and left the span vulnerable to complete collapse in the event of an earthquake. It was nothing more than a Band-Aid, he said.

An Associated Press article quoted a driver as saying the accident yesterday had caused her to lose “so much confidence in the experts, the millions of dollars that are being spent to reconstruct and build a new bridge,” referring to the decade-long project that will eventually replace the entire cantilever section with a suspension bridge.

The failure was probably caused by continuous heavy winds this week, CalTrans said. Wind continued gusty today while a new repair was being worked on. Asked to describe what the new design was like, a CalTrans spokesman said, “Think of a big belt around a piece of wood.”

Somehow that image doesn’t comfort me.

California Highway Patrol officers are still working, two hours after the incident, to clear heavy traffic from the bridge, after which it will be closed in both directions indefinitely. Monitor the Twitter account @baybridgeinfo for information.

Update: All westbound lanes reopened a little after 8 pm tonight.

A Safeway truck flipped around 2:30 this afternoon after encountering the new S-curve on the Bay Bridge, leading to these pictures: a parking lot on the westbound incline, and a completely empty stretch of roadway after the site of the crash, just before the Yerba Buena Island tunnel.

Click the pix for more webcam images, of get the story and video on the KPIX website. More on the KGO TV website, including the obvious:

The driver, who suffered a bruised leg, was driving 55 mph in the 40 mph zone and did not know the speed limit had been changed. He said he had not driven over the bridge since before Labor Day and was taken by surprise by the S-curve.

CalTrans will reopen a brand-new Harrison St. offramp from the Bay Bridge to the South Beach district at 5:00 a.m. Monday morning, three and a half years after the original exit closed in 2005. For drivers new to the area, the exit is a left exit off the bridge, half a mile before the left-hand Fifth St. exit.

The new ramp is another milestone in the multi-year project to earthquake-retrofit the bridge, the biggest piece of which will replace the eastern span (the part between Yerba Buena Island and Oakland) with a new suspension structure due to open, oh, seven or eight years from now.

The Golden Gate Bridge District, which is not managed by the Calif. Dept. of Transportation or CalTrans, sets its own tolls. The fare to cross CalTrans bridges in the Bay Area, including the Bay Bridge, remains at $4.

If you’re new in town and don’t understand which bridges we mean, here are the Golden Gate and Bay Bridges. Flickr photo by user brothergrimm.

Could be because of Burning Man, or all the local Democrats that went to Denver for the Democratic Convention are taking a long weekend, or maybe that whole staycashun thing is catching on. But the Bay Bridge sure was easy tonight.