London’s traffic congestion once meant that residents of the British capital had to endure some of the worst air quality in the developed world. In a bid to tackle an issue directly linked to deaths and respiratory problems, the city introduced some of the toughest restrictions on heavily polluting cars anywhere. The policies almost flipped a switch on adoption of electric vehicles. Note: Vehicles licensed in London may be used elsewhere. Source: UK Department for Transport Since they were put in place three years ago, these restrictions cost drivers of diesel and gasoline cars as much as £27.50 ($30.72) a day to enter the center of London. The number of licensed fully electric vehicles has increased more than fourfold in that span. The proportion of diesel cars has dropped more than a quarter. While direct comparisons between cities are difficult, there are indications London’s tolls have succeeded in supercharging […]