It also is a sign of transportation projects on the move. The parkway’s final $30.1 million segment, from Allen Road to the Heath Road and Stockdale Highway intersection, is due to be completed next year, while planning continues for the controversial Centennial Corridor, which will connect the parkway to Highway 58 and, eventually, Interstate 5.
Along with the improvements of CA 58 eastward to Barstow, I don't see why I-40 shouldn't continue further west in the future. It already connects to I-95 in the East, so why not I-5 in the West? (I-10, I-80 and I-90 already connect to both.)
It should, not because I-5 is the westernmost 2di, but because I-40 is the best route from California to the southern midwest and southeast. Produce from California's Central Valley, manufactured goods from S.F.; the quickest route is I-5, cross the southern Central Valley at CA-46 or CA-58 to Bakersfield, than CA-58 to Barstow. I-80 is possible, but it takes a lot of gas to climb up to Donner Pass, and if continuing east through the Rockies too, and they are both subject to closure in the winter. Barstow is not the logical west end of the route, I-5 is.