Antje Tiefenbach, a 25-year-old engineering student in Ulm, Germany, normally drives a Fiat Punto she bought four years ago for €8,000 ($10,200).
Two or three times a month, however, when she meets friends for drinks in town, she hires a Smart minicar for the trip under a car-sharing scheme devised by Daimler, the brand's owner.
She books the nearest car on her mobile phone or the internet, unlocks it with an electronic chip in her driving licence, drives off and then parks and leaves the car anywhere in the city centre.
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