Question: What percentage of gasoline consumed in inner-city regions is used by motorists looking for parking spaces?  How can “smart cities” technology help?

Answer: Can be found at Clean Energy Answers.

Relevance: This is yet another example of how smart cities are relieving congestion, reducing pollution and alleviating frustration all at the same time.  It works by Internet-enabling each parking meter such that smart phone users can see what spaces are available.