Uber and Lyft have stopped or threatened to stop serving cities around the country. When they actually do, start-ups and riders scramble to fill the hole.
Slow to build and expensive to operate, streetcars could be the most maligned mode of transportation in America. Still, cities keep building them.
Seattle’s struggle to attract riders reveals what makes a bike-share program thrive -- or in the Emerald City’s case, barely survive.
After a population explosion and building binge led to haphazard and random growth, Miami became the nation's first big urban area to adopt a citywide code based on looks.