The U.S. federal government will designate 48 routes as electric charging corridors to allow coast-to-coast travel and encourage the adoption of electric vehicles, the White House said Thursday. The routes—determined by the U.S. Department of Transportation—will cover 25,000 miles in 35 states. Electric vehicles owners should expect access to a charging within 50 miles along those corridors. The Federal Highway Administration will develop streamlined signage to point drivers in the right direction across the country.…