The city of La Paz, Bolivia, has long struggled with transportation issues. Steep terrain, high density, and narrow streets have resulted in years of traffic nightmares for fleets of minibuses and private taxis. In the past two years, the government has worked to alleviate this by building the largest urban cable-car system in the world. Currently La Paz has three urban ropeway lines in operation, stretching over 10 kilometers, with plans to triple the size of the network. The city recently announced six new lines, which will extend the aerial system to 30 kilometers and carry up to 27,000 passengers an hour.