The pressing need to improve transportation systems can be seen in the thick smog that wafts over the freeways of Los Angeles and the gnarled traffic that often makes the streets of Beijing seem like a parking lot.
The global push to improve transit infrastructure involves a complex matrix of connected high-speed rail, commuter trains, electric buses, monorails, and street trams — as well as environmentally sensitive aircraft, which are energy efficient and reduce carbon emissions.
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Wall Street Journal