The Waymo driverless car is displayed during a Google event Tuesday, Dec. 13, 2016, in San Francisco.
The Waymo driverless car is displayed during a Google event Tuesday, Dec. 13, 2016, in San Francisco. Eric Risberg AP
The Waymo driverless car is displayed during a Google event Tuesday, Dec. 13, 2016, in San Francisco. Eric Risberg AP

Driverless cars to be tested on N.C. 540 Triangle Expressway toll road

January 20, 2017 6:22 PM

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  • Here's how a diverging diamond interchange works

    The N.C. Department of Transportation made this video to explain the "diverging diamond" interchange or DDI. The department is planning to build two of them in the Triangle, at the Beltline and Western Boulevard in Raleigh and at Interstate 40 and N.C. 42 in Johnston County.