Latest Bay Bridge misbehavior: A harrowing bike ride on the lower deck

@radhya took this photo of the backed up traffic on the lower deck of the Bay Bridge on Aug. 6th, 2018. @radhya took this photo of the backed up traffic on the lower deck of the Bay Bridge on Aug. 6th, 2018. Photo: Instagram / Radhya Photo: Instagram / Radhya Image 1 of / 1 Caption Close Latest Bay Bridge misbehavior: A harrowing bike ride on the lower deck 1 / 1 Back to Gallery

There are no bike lanes on the lower deck of the Bay Bridge, which makes sense as bicycles are not allowed on the lower deck of the bridge.

But that did not stop a woman on a cruiser from pedaling across the span as cars whizzed by.

Instagram user laydbug caught the action Tuesday on her phone and uploaded a few seconds of footage. The cyclist is seen in the second and third lanes from the right, repeatedly looking back to see what might be gaining on her — which of course was every vehicle behind her on the bridge at the time.

At one point she is seen straying perilously out of one lane and into another.

She was not wearing a helmet.

A post shared by Alicia Cocchi (@laydbug) on Aug 20, 2018 at 6:10pm PDT

Evidently, she made it across without inducing any brake-squealing near-misses.

MORE: Car trouble on the Bay Bridge? Don't be this guy

The dangerous crossing comes only weeks after a family stopped their sedan and blocked an entire lane of the Bay Bridge in order to change a flat tire on the upper deck.

More recently, motorists were inconvenienced Sunday morning when the upper deck of the bridge was illegally blocked so multiple sideshow drivers could do doughnuts on the span. One man was arrested.

In May, two men, probably in their 20s, were seen riding motorized scooters at the entrance to the lower deck of the bridge and on the emergency pedestrian walkway on the left side.

Taking bicycles or motorized scooters (the stand-on type like Bird and LimeBike) on the bridge is illegal, according to the California Highway Patrol.

"On every highway approach, you'll see these black and white regulatory fines signs," CHP spokesperson Vu William told a reporter, noting that they prohibit the use of bicycles and motorized scooters on freeways.

Bicycles can be ridden on a bike path separated from traffic on the eastern span of the Bay Bridge.

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Read Mike Moffitt's latest stories and send him news tips at mmoffitt@sfchronicle.com.

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