The Washington, D.C. license plate lookup tool is seeing early success on Twitter. Now its creators want to develop it into a fully fledged mobile app.

Designed to influence city policy, the new website provides a starting point for public discussion about an issue that's relatable to anyone who's ever parked in a bad spot.

Startups are often admired for upending the market with innovative ideas, but a government official in one of the nation's most progressive cities says companies need to ask permission first.

The city is installing more parking sensors to expand LA Express Park, an app-powered, sensor-fueled smart-parking program expected to eventually cover the entire city.