Motorists in the German city of Leipzig are being offered free public transport for a week in a bid to persuade them from driving to work.
Commuters will be allowed on trams, buses and trains when they show their driving licence.
The BBC reports the hope is that motorists will be persuaded to leave their cars at home permanently.
Rising fuel prices have led to recent calls for tax on petrol to be cut, although commuters are already able to offset their journeys to work against income tax.
