Investigators looking into the collapse of a Pittsburgh bridge last year want transportation officials nationwide to examine more than 10,000 other bridges with similar steel construction. The National Transportation Safety Board says in a report Thursday it wants states and cities to make sure their bridges don’t have corrosion like what they found on the bridge that collapsed. The safety board says drainage problems on the weathered steel bridge caused parts of it to deteriorate over time. It says Pennsylvania neglected for years to clear the debris, dirt and leaves that were causing the problem, even though inspectors noted the issue. The Pennsylvania Transportation Department didn’t immediately respond to the recommendations.