This is a poster in the city of Münster's Planning Office showing the amount of space taken up by cars, a bus, and bicycles used to transport the same number of people. Dated August 2001. (Click thumbnail for larger view)
It assumes one car per person, I suppose, but judging from the jams at rush hour on the CTE, that is not an unreasonable assumption.
Photo credit: Press-Office City of Münster, Germany,