The cars started lining up an hour before pop music star Gwen Stefani wrapped up her concert at St. Paul's Xcel Energy Center.
As 5,000 concertgoers streamed out of the arena, the drivers went to work. "Do you want an Uber ride?" asked one. Another held up a big piece of paper marked "Uber" and told passersby they could save a lot of money by paying him cash for a ride.
In the scramble to get home, it was impossible for customers to tell which of the drivers actually worked for Uber. Half the vehicles were not displaying corporate logos, as required by law. Most of the drivers openly solicited potential customers on the street or agreed to take cash for a ride, tactics that are illegal for Uber drivers.
Such scenes have become common in the Twin Cities, where Uber and the rival service Lyft now provide more rides than traditional taxicabs. Operating with little city oversight and less stringent rules than taxis, an informal and dangerous ride-sharing culture has emerged in which people casually hail unmarked cars and barter for rides.
Uber and Lyft both tell customers they shouldn't get in vehicles unless they first book their ride through the companies' phone apps. But many people ignore the warnings, accepting rides from strangers who sometimes turn out to be predators.
At least five women in the Twin Cities have been abducted or assaulted by men who presented themselves as Uber drivers in the past two years, police reports show. In Atlanta, Los Angeles and other cities, men pretending to work for Uber have been charged with attacking women after luring them into their cars. Chicago police warned last year of robbers posing as Uber drivers.
"The whole idea behind this service was that people were supposed to know what they were getting," said St. Paul Council Member Dan Bostrom, a former policeman. "I am concerned that folks are putting their lives in the hands of somebody they don't know in a vehicle they don't know anything about."
In recent months, Star Tribune reporters repeatedly observed drivers ignoring regulations aimed at protecting the public, making it difficult to distinguish a legitimate ride-sharing vehicle from a fake.