Abstract
Transport is an essential component of economic activity and is often envisioned as a driver for urban development and a key contributor to economic returns. Transport also has direct (negative and potentially positive) impacts on the health of a population. Transport provides many jobs, which is normally good for the income of people and their health. However, there are also many negative health impacts of transport, particularly motorized transport in cities such as motor vehicle crashes, high air pollution and noise levels, heat island effects, and lack of green space and physical activity. It is now well recognized that there is a relationship between land use, transport, and health, and to change transport and health, one has to change land use. In this chapter, we provide an introduction to the topic and make some suggestions on how to reduce the negative health impacts. Land use changes, a move from private motorized transport toward public and active transportation and change in policy assessment, are all needed to make transport healthier.
Introduction
Transport is an essential component of economic activity and is often envisioned as a driver for urban development and a key contributor to economic returns. It is important for moving goods and people and provides āthe right connections in the right placesā (Eddington, 2006). Urban transport networks facilitate the economic competitiveness, social progress, and cultural diversity of urban areas (Eddington, 2006; Hall et al., 2014). Transport also has direct (negative and potentially positive) impacts on the health of a population. For example, the car industry is a large employer and exports products in countries such as Germany and Spain and therefore boosts the economy, which is generally good for health and health care, for example, because of better income for workers. Road construction and maintenance is also a large employer and responsible for many jobs. Motorized mobility is a criterion for measuring country-level economic success, and the level of automobility is often seen as a function of income and/or social status (Ecola et al., 2014). However, there are also many negative health impacts of transport, particularly motorized transport in cities. These impacts, as shown later in this chapter and book, are particularly connected to the use and prevalence of motorized transport. In developed countries, there is a cultural and economic dependence on motor vehicles as the primary mode of transport dominates urban transport design and planning and reduces the opportunity of other and healthier transport modes (Jeekel, 2013). Though mass motorization started later in developing countries, it is growing rapidly, causing similar problems in many developing cities (Dargay et al., 2007).
The adverse health impacts of motor vehicle traffic are striking, with over 1.3 million deaths and 78 million injuries warranting medical care are due to motor vehicle crashes (MVCs), each year globally (Bhalla et al., 2014). Traffic-related exposures, including air pollution, greenhouse gases (GHGs), noise, dwindling green space, and urban heat islands (UHIs), contribute to the climate crisis, environmental pollution, and degradation, which, in turn, impacts negatively on the populationās health and is responsible for millions of deaths and cases of disease each year (Nieuwenhuijsen, 2016). Mass motorization and the associated lack of physical activity (PA) have resulted in a large disease burden and contribute to a large number of annual deaths due to physical inactivity. Current urban forms and lack of infrastructure for active travel are furthermore reinforcing the excessive use of motorized transport for short-distance trips (Cervero and Duncan, 2003; Giles-Corti and Donovan, 2002), further contributing to increased traffic-related environmental exposures and reduced opportunities for PA. Outdoor air pollution and decreases in PA, both to some extent caused by motorized traffic, are associated with annual estimates of 4.2 million and 2.1 million global deaths, respectively (Forouzanfar et al., 2015). There is, however, emerging evidence that sustainable transport infrastructure and modes such as cycling, walking, and public transport/transit can be effective in promoting an increase in active commuting (Heinen et al., 2015; Panter et al., 2016; Heath et al., 2006), thereby also having the potential to reduce deleterious traffic-related environmental exposures (Woodcock et al., 2009; Grabow et al., 2012).
Trends
There are two key trends of development that are responsible for the negative health impacts of traffic; rapid urbanization and mass motorization. The urban population is still expected to rise from 50% at the moment to 70% in the next 20 years (Rydin et al., 2012), while the number of cars is expected to rise from the current 1 to 1.6 billion in 2040 (Bloomberg New Energy Finance, 2017). Rapid urbanization coupled with excessive catering for car use in these areas has led to dominance of the car in many places. Even though private motorized transport may not be the predominant mode choice in many cities, cars still occupy a large proportion of public space due to the infrastructure needed for them such as roadways and parking spaces. And although some cities in the developed world are recognizing the negative impacts, car-centered urban models are still the widespread norm (United Nations Human Settlements Programme (UN-HABITAT), 2012). Car-centric urban models allowed and have led to urban sprawl as car travel enables traveling for longer distances between residences and work (United Nations Human Settlements Programme (UN-HABITAT), 2012). A large proportion of the population lives and works in close proximity to highways and roads, including children, as schools are often located in high traffic pollution exposure areas (Health Effects Institute (HEI), 2010; Brandt et al., 2015). Exposures to heat, air pollution, and radiation are often enhanced in urban areas (Vanos, 2015)...