The effect on congestion will depend a great deal on the speed at which fully automated vehicles enter the mainstream and the business models that accompany them. If people continue to want their own individual vehicle, the impact of self-driving vehicles will not be as dramatic as the scenario in which people can call up automated transport as and when they need it. UK Autodrive will carry out research to further investigate the possible effects on congestion, but one study carried out by the Massachusetts Institute of Technology, using transport data provided by Singapore, suggested that the Southeast Asian state could reduce the number of cars on its streets by a third by adopting automated vehicle technology. A 2015 OECD report based on car usage in Lisbon suggested that a city-wide self-driving taxi service combined with high capacity public transport could reduce the number of cars on the roads by anything up to 90%. As well as leading to a reduction in the total number of cars, automated vehicles are expected to drive more efficiently and are also increasingly likely to be fitted with electric motors (due to their ability to dock and recharge themselves in between pick-ups), all of which should combine to lessen the amount of harmful emissions released into the environment.