In Paris, France, a new provider was able to negotiate with the mayor and get outdoor ad space in exchange for a bicycle rental program. What is one feature of Paris that he credits for helping get this done (something that is absent in many other cities)?

Paris has bicycle lanes separate from other traffic using physical barriers such as a kerb.  This makes the use of bicycles in Paris to be highly encouraged and patronized.   There are many people, especially tourists, who need bicycles to tour the city.  The mayor is very much aware of the need for a bicycle rental program to sustain this feature of the city (a city of bicycles).

Explanation:

According to wikipedia.com, "There are 700 kilometers (430 miles) of cycle paths and routes in Paris, including piste cyclable (bike lanes separated from other traffic by physical barriers such as a kerb) and bande cyclable (a bicycle lane denoted by a painted path on the road)."

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