In 1957, a full size system was successfully demonstrated by RCA Labs and the State of Nebraska on a 400-foot strip of public highway at the intersection of U.S. Route 77 and Nebraska Highway 2, then just outside Lincoln, Nebraska. A series of experimental detector circuits buried in the pavement was paired with a series of lights along the edge of the road. The detector circuits were able to send impulses to guide the car and determine the presence and velocity of any metallic vehicle on its surface. A previous test installation of the system in September 1954 along U.S. Route 73 and U.S. Route 75 in Cass County, Nebraska, was utilized as an experimental traffic counter. It was developed in collaboration with General Motors, who provided two standard car models with equipment consisting of special radio receivers and audible and visual warning devices that were able to simulate automatic steering, acceleration, and brake control.
https://www.nhtsa.gov/technology-innovation/automated-vehicl...
In 1957, a full size system was successfully demonstrated by RCA Labs and the State of Nebraska on a 400-foot strip of public highway at the intersection of U.S. Route 77 and Nebraska Highway 2, then just outside Lincoln, Nebraska. A series of experimental detector circuits buried in the pavement was paired with a series of lights along the edge of the road. The detector circuits were able to send impulses to guide the car and determine the presence and velocity of any metallic vehicle on its surface. A previous test installation of the system in September 1954 along U.S. Route 73 and U.S. Route 75 in Cass County, Nebraska, was utilized as an experimental traffic counter. It was developed in collaboration with General Motors, who provided two standard car models with equipment consisting of special radio receivers and audible and visual warning devices that were able to simulate automatic steering, acceleration, and brake control.