While coming from DHN side to BWN, there is big bridge being constructed. Looks like a Cable Stay bridge (similar to San Fransisco, Golden Gate Bridge). These bridges are expensive to build and maintain, as compared to a normal bridge and are made only where span between two support pillars is very large. Any idea why use this for a normal Road-Over-Rail bridge? Does the railway line below obstruct construction of regular pillars. Under such circumstances, there is a slight alignment change in the tracks to avoid such expensive constructions. Any ides?