A well-functioning transport system is crucial for societies. It allows people to reach activity locations such as work places, schools, health services, other people and recreational facilities. In many countries people spend 10-15 percent of their income on transport (Schäfer et al., 2009), and ministries of transport generally have a substantial share in the overall budget for governmental expenditures. A large part of the budget is spent on infrastructure construction and maintenance, roads, railroads, harbours and airports being dominant categories of infrastructure. An extreme example: in 2009 in China the share of transport investments in GDP was 5.64%(Yu, 2016).
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