A $7.25 million, 850-foot pedestrian bridge and guardhouse for the Volkswagen plant won approval from a city panel Tuesday. The steel-and-glass structure, more than one-quarter the length of the Walnut Street Bridge that spans the Tennessee River, will serve as the main entrance to the auto plant. The pedestrian bridge, paid from city, Hamilton County and state funds as part of the automaker’s incentive package, will cross over a stream and one of VW’s vehicle test tracks and negotiate a steep change in elevation at the site, officials said. “It will be an extraordinary bridge,” said Steve Leach, the city’s...