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Real-time car traffic startup Inrix has raised $37 million in a fourth round of funding led by high-profile venture firms Kleiner Perkins Caufield & Byers and August Capital.

Inrix is one of the leaders in crowdsourced real-time traffic information that helps drivers skirt traffic jams and plan their routes in advance. Inrix supplies this information to auto manufacturers, mobile developers, transportation agencies, fleet operators, and internet companies.

Inrix collects information from more than 10 million sources, including taxis, cars, delivery trucks, and other information sources. It offers data for traffic in 22 countries and reaches more than 100 million users. Partners include Audi, Adac, Ali, ANWB, Ford, I-95 Coalition, MapQuest, Microsoft, Navigon, Tele Atlas, Telmap, TeleNav, Texas Transportation Institute and Toyota. Inrix’s traffic apps have been downloaded 1.5 million times on the iPhone and Android.

The company has raised $70 million to date and its valuation is a little less than $500 million. The Kleiner Perkins money came from the company’s Green Growth Fund. Inrix is profitable and growing revenue by 100 percent a year.

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