Kansas City voters approved a light rail system in 2006 to address issues of oil prices, global warming, and sustainable development. The proposal aims to create "defensible space" along the light rail line through mixed-use and pedestrian developments to encourage use of public transportation by making people feel safer. The proposal would integrate daily life with the rail system by providing a bike path and commercial developments, partially funded by developers who would benefit. Environmental quality would improve as the rail system expanded with sustainable power sources at stations and developments along the line. The proposal would enhance connectivity by running the light rail vertically and horizontally according to population density.