State transportation agencies halted proposals to widen freeways in Denver and Portland amid rising costs, lawsuits, and stark questions about the projects’ destructive effects on the environment.

Congressional leaders are bracing for a fight with the Trump administration over changes to the environmental review process.

"People said, 'This would change my life,'" said the visionary behind a Buckeye State rail system.

More Americans have been dying on high-speed roads because cities and states haven't built proper infrastructure to help people cross safely, a new study shows.

Congress has some stocking stuffers and a few lumps of coal for the transportation sector in the $1.4 trillion spending package the House of Representatives passed on Tuesday in one of the last votes of the year before impeachment.

Smart Growth America: include community members in planning, hire more diverse staff, and stop displacing residents to combat generations of structural racism

Why can't our country solve its emissions problem? Because we are effectively two nations: A blue nation that is committed to fighting climate change, and a Trump nation that is not.

"Cities can provide more infrastructure that’s safe," the director of the New Urban Mobility Alliance says.

Curb space is the Wild West of neighborhood transportation.

The Missouri metropolis is set to provide free bus service for residents but state and local governments take more steps to ensure transit thrives in the region.