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The map below shows I-40 current road weather conditions, radar, and forecast information. I-40 is 2,560 miles long and is a major cross-country freeway spanning 8 states. Running along the lower southern states in the U.S., it connects the desert Southwest to the Southeastern United States.Starting in Barstow, California, I-40 follows the historic Route 66 across the Mojave Desert. After crossing the Colorado River in Arizona, it gains elevation on route to Flagstaff, AZ. Passing across New Mexico, Texas, Oklahoma, Arkansas, Mississippi, Alabama, Georgia, finally arriving in Wilmington, N.C.