Over the past year, hundreds of you have asked Whistleblower for help. While we can't investigate each tip, we want to share more of what you tell us. In 2009, we started publishing a few tips each week to stimulate online discussion and create ways for our readers to help each other. Unlike our news stories, we have not verified this information, so we do not include the names of the parties involved. If you have a tip, send it to whistleblower@startribune.com.

A Minneapolis reader said he's alarmed by the driving habits of certain paramedics:

"I pay attention to things that are going on around me. Something that I have noticed for over a year now is strange behavior by ambulances."

Last month, according to our tipster, an ambulance made a rapid U-turn into a downtown parking ramp on Hennepin Avenue with its siren blaring, then came out the other side with its siren and lights off.

This month, an ambulance turned on its siren as it sped toward the tipster, from "out of nowhere," he said.

Unlike delivery trucks, most emergency vehicles don't have signs encouraging motorists to report bad driving. Have you ever reported unsafe actions by an emergency vehicle?