Design errors, poor management and inadequate maintenance are among the probable causes of the collapse of a steel arch bridge in northeastern Taiwan that killed six people last year, according to an investigation report issued Wednesday.The Taiwan Transportation Safety Board said in the report that the collapse of the Nanfangao Bridge at a fishing township in Yilan County was mainly caused by corrosion of the steel cables coupled with inadequate maintenance and improper management.Board member Yeh Ming-shan told a press conference that each main cable of the bridge, completed in 1998, cons…READ FULL ARTICLE