Urban planners advise that cities with populations of more than 2 million should have mass transit systems.
Over the next 20, it could build as many as 170 new mass transit systems.
This led New York authorities to step up security on the city's mass transit systems.
We've already approved nearly a thousand transportation projects to upgrade airports, railroads, mass transit systems, and shipyards.
Sandy roared ashore Monday night, knocking out power to millions of people, and flooding mass transit systems across the Northeast.
As we've been reporting, in the wake of today's bombings in London, US officials have raised the terror alert level for mass transit systems.
This would put a stop to highway construction, bridge repair, mass transit systems and other important projects that keep our country moving quickly and safely.
WHITEHOUSE: Weekly Address: Time to Act on the Transportation Bill
This provides funding for highway construction, bridge repair, mass transit systems, and other essential projects that keep our people and our commerce moving quickly and safely.
WHITEHOUSE: President Obama Tells Congress to Pass Extensions
He told delegates that steps such as setting tighter rules on car emissions, regulating for energy efficient goods and building urban mass transit systems are already having an impact that can be measured.
That change in perception is providing more momentum for some cities that were already moving away from six-lane highways and suburbs dozens of miles apart, to a series of urban centers connected by light rail and other mass transit systems.
CNN: U.S. cities scrambling to meet rising mass transit demands
Instead, they are looking for what Leinberger calls "walkable urbanism" -- both small communities and big cities characterized by efficient mass transit systems and high density developments enabling residents to walk virtually everywhere for everything -- from home to work to restaurants to movie theaters.
CNN: Is America's suburban dream collapsing into a nightmare?
Tokyo has shown that mass-transit systems need not be a poor or dirty option.
Charging motorists for scarce road space, with most of the revenues being used to finance improvements in bus, rail or urban mass-transit systems, is the only sensible route to restraint.
Founded in 1942 as a manufacturer of snow-going equipment, it grew rapidly in the last quarter of the 20th century to become a diversified manufacturer of products ranging from mass-transit systems to personal watercraft.
By the same token, the yearning for government spending on "infrastructure" to stimulate economic activity creates an opening for the new president to push the kind of green projects that fit his call for a transition to alternative energy sources, including new kinds of mass-transit systems.
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