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http://newsroom.aaa.com/2015/04/annual-cost-operate-vehicle-falls-8698-finds-aaa-archive/
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http://www.rand.org/pubs/research_briefs/RB9755.html?utm_source=t.co&utm_medium=rand_social
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4. Barter, P.: Cars are parked 95% of the time. Let’s check! (2013).
http://www.reinventingparking.org/2013/02/cars-are-parked-95-of-time-lets-check.html
5. Bösch, P.M., Ciari, F., Axhausen, K.W.: Required autonomous vehicle fleet sizes to serve different levels of demand. In: Transportation Research Board 95th Annual Meeting, (2016).
https://www.ethz.ch/content/dam/ethz/special-interest/baug/ivt/ivt-dam/vpl/reports/ab1089.pdf