TASMAN BRIDGE Vessels of 25m or more in length are restricted to the Main Navigation Span. Vessels between 15m and 25m in length are restricted to using the Secondary Navigation spans i.e. the spans adjacent to the Main Navigation Span. Vessels of less than 15m in length may use any span, other than the Main and Secondary Spans. Additional lighting in the form of fixed yellow neons is suspended from the underside of the overhead span directly above the Main Navigation Span abutments. When two vessels are approaching the bridge from opposite directions, the vessel proceeding downstream (i.e. southwards) has the right of way.