"It's important for me to hear what people really think," Stoltenberg said in revealing his recent afternoon as a cabbie. "If there's one place where people say what they think, it's in the taxi."
The Daily Telegraph reported Stoltenberg wore a standard uniform and dark glasses while driving passengers to their destination. The British newspaper said Stoltenberg had a couple of rough moments as a driver, with the car suddenly lurching to a halt when he mistook the brake pedal for the clutch.
"This driving is not exactly the best I've seen," his passenger said.
Stoltenberg posted a video about his experience on Facebook, Twitter and YouTube.
The undercover work comes ahead of Norway's Sept. 9 general election. The Times of London reported Monday the latest opinion polls indicate the Labor Party leader's center-left coalition government appears likely to lose.