AirSage, which is developing technology for delivery of real-time traffic based on data gathered from devices such as cell phones, has closed on $6 million in new capital.

Constellation Partners led the round. The firm is based in Switzerland.

AirSage, which was founded in 2000, has now raised $11 million in venture capital.

The news was first reported this week by Red Herring. Private Equity Wire also noted the deal.

AirSage has partnered with Sprint Nextel to gather location data from phones used by the wireless provider’s customers. Mobile phones are required to provide geographic information in order to meet requirements for E-911 service.

“A cellular network inherently needs to know where you are,” AirSage Chief Executive Officer Cy Smith told Red Herring. “They already have a location awareness component. We don’t need to wait for GPS.”

AirSage already has contracts with four state transportation departments, including Georgia.

IntelliOne, which is also based in Atlanta, is developing a traffic information service.