Vienna is set to reward those who get around the city on foot, by bicycle or by public transport instead of using their cars. The Austrian capital is trialling a smartphone app that uses motion-tracking to measure the distance covered and the CO2 saving made.

When users have saved 20 kilograms of CO2—the equivalent of about two weeks of walking, cycling or using public transport—they receive one “culture token”.

Tokens can be exchanged for free tickets to four cultural venues: the Volkstheater, the Vienna Museum, the Kunsthalle and the Konzerthaus.

“We want to reward CO2 reduction with a cultural experience,” says Vienna city council member Peter Hanke. If the trial is a success, the scheme will be rolled out to the entire capital.