You know you're a bad driver if your neighbors start a Facebook group about it.

I'm talking about Bay View Prius Lady and its 620 members who swap horror stories about her speeding, recklessness and horn blowing.

It's part public shaming via social media, and part call to action before someone is seriously hurt.

"A video was posted this week of her cutting off a school bus that was turning left. She wedged herself to the left of it to turn left in front of it. A lot of people are concerned because it's an accident waiting to happen," said a member of the group who initially said I could use his name but changed his mind. Media attention has made the group uneasy, and it's considering a change of tactics to work with the woman's family members.

"She's sort of taken on local celebrity status, like a Milverine sort of thing, in the neighborhood. But with a little streak of fear attached to it," the member said. Milverine is the local look-alike of movie character Wolverine who walks shirtless around the city and sparked a Facebook page six years ago.

Prius Lady turns 70 this year, according to court records from the times police spotted her aggressive driving. One is an inattentive driving case in 2014 that was reduced to a speedometer violation. The other is a speeding ticket in Bay View from 2015.

I knocked on her door this week and left a message in the mailbox to contact me. But I didn't hear from her. I've been listening for screeching tires outside the Milwaukee Journal Sentinel building in case she decided to talk in person. You think of Prius owners as trying to save the planet, not terrorize it.

There's another side of the Prius Lady — dog lover. State Rep. Christine Sinicki and others have reported that she stops to talk to people walking their dogs.

"She was very polite to me, very smiley," said Sinicki, who follows the Facebook group. Only later did she discover the woman was the infamous Prius Lady.

"Something must click in her when she gets behind the wheel," Sinicki said. "I once posted on there: Does the woman even know there's a Facebook page devoted to her?"

The answer, apparently, is not until very recently. Someone who knows her posted on the page that the woman was "devastated" to learn of the public scrutiny of her driving, which has gone on for a year or more.

I guess most of us don't want to think we're being watched and discussed, though the group is open only to accepted members and does not mention her name. I'm following their lead and keeping the woman's name out of this article.

The person acquainted with Prius Lady posted: "I've known this gal for many years, know her family as well, and I finally got ahold of her brother and made him aware of the situation."

The typical online observations on Facebook don't hold back:

"I wonder if she thinks the Hoan was redone as a freshly paved drag strip."

"Laying on the horn because the light won't change fast enough for her." (With a photo of her at that light.)

"She was on 6th St. this morning. Watched her speed behind me and then tailgate. Cut me off with an illegal right. Then blew through a parking lot."

When some body damage appeared on the woman's car, someone posted a photo.

The site recommends that people report her infractions to the community liaison officers at the District 6 police station. I called over there and didn't hear back. I'm sure the police are too busy to follow her around every time she pulls the dark gray Prius out of her garage.

County Supervisor Jason Haas called the Prius Lady "a mythical figure in contemporary Bay View lore." He has seen the messages posted about her and even shared one speed-demon sighting with the group, which he believes has a genuine concern about safety.

"They just wish something could be done," he said. "But it's not to the point where people are carrying torches and pitchforks."

Just smartphones and laptops.

Call Jim Stingl at (414) 224-2017 or email at jstingl@jrn.com