The San Gabriel Valley has been a hub of transportation since ancient times.
The Tongva, who first settled the region, blazed paths that would later be trod by the Spanish settlers, paths that became the I-10 freeway, Arrow Highway, and Route 66/Foothill Boulevard. Ancient riverbeds became the routes of the 57, I-605, and I-710 freeways.
In the 20th century, Route 66 was the gateway for motorists and fortune-seekers headed to the Pacific, catching their first glimpse of the balmy West Coast as they descended into the San Gabriel Valley. Post-WW2 prosperity prompted the expansion of the ancient pathways to become the freeways that trace the north, middle, and south of the valley (the 210, 10, and 60 freeways).
Today, locally-run groups like A.C.E. and the Metro Gold Line are tackling transportation issues in spots where congestion has become a problem: expanding California Route 71, reworking the 57/60 interchange, and expanding the Metro Gold Line to reach from downtown Los Angeles all the way to Claremont on the east end of the valley.
At the same time, Foothill Transit and local bus-makers are experimenting with cleaner mass transit vehicles.
As the priciple route for goods from the Ports of Los Angeles to the rest of the country - by truck, train, and now energy-efficient freight and mass transit vehicles - the San Gabriel Valley will always be a world on the move.