Two men posing as police officers carried out fake traffic stops in Ramsen, Canton Schaffhausen, early Friday morning.
According to Schaffhausen police, the pair used a white Tesla and were stopping vehicles near the Petersburg/Faselroo junction around 2 a.m.
A 19-year-old woman saw them stopping others, before flagging her down.
They demanded to see her licence, asking her to get out and open the boot.
She became suspicious and fled when the men failed to show any identification.
Police are appealing for witnesses and any information about the white Tesla with Swiss plates.
Trees down, power out across western Switzerland
Police frank about French crime wave
Skiing to be more expensive this season
Thousands struggle with basic skills
Army sergeant throws cat at recruits
Clock change sends people to the ER
