I got on a taxi at a taxi stop (in my country there are designated spots where only the registered cabs for each specific spot can park) and the driver was speeding, hitting all the bumps on the road, zig-zagging, etc. My wife and our baby was in the car with me. I complained, didn't work, then I went back to the stop a couple of days later and complained to the other drivers of said spot. They all said they constantly received complaints for that guy, but since he was "one of the oldest drivers here, can't do nothing about it".