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Forty years ago, Route 66, the highway that ran the 2448 miles from Chicago, Illinois to Santa Monica, California, was formally decommissioned, usurped by a more modern, high-speed interstate. But the road has lived on in the collective imagination — a symbol of freedom, adventure, and new beginnings, of America's concept of itself.

In this meditation on the Mother Road, as John Steinbeck christened it, Laura Barton explores 66's shifting identity, from migratory route to America's Main Street.

With contributions from Angel (the "Angel of Route 66") and his daughter Clarissa Delgadillo in Seligman, Arizona; Mike Cowen who set up his own Historic Route 66 museum in Williams, Arizona; Leigh Anne Isbell of the Devil's Rope Museum in Texas and Candacy Taylor, who's written about Route 66 in relation to The Green Book.

Written and presented by Laura Barton
Location recording producer, Diane Hope
Produced by Alan Hall
A Falling Tree production for ÃÛÑ¿´«Ã½ Radio 4