CHICAGO --Traffic is flowing smoothly on the new North Avenue Bridge over the Chicago River. Chicago Mayor Richard M. Daley officially opened the bridge Friday. The sleek suspension-cable bridge replaces a wooden bridge that had been used for almost 100 years. The first of its kind in the city, the new bridge features two full lanes of traffic in both directions, double the capacity of the old one. It will ease traffic congestion on busy North Avenue and provide a link to paths for bikes and pedestrians along the river. The $25 million project took almost two years to complete.