The relative risks of hazardous material spills in the 13-km-wide Abegweit Passage between Prince Edward Island and mainland Canada are analyzed, and counteractive measures are discussed for an existing ferry crossing and an alternative link by a bridge. The spills can originate from trucks hauling dangerous goods on board ferries or over the bridge, ships involved in collisions with the ferries or in strikings of the bridge piers, and ferry or bridge maintenance operations. A methodology is developed for the analysis of the marine spill risks associated with the vessel traffic stream crossing (a) a ferry route and (b) a bridge line. Because study-specific data are available neither on spill sizes nor on the conditional probability of a release from a vessel or truck damaged in an accident, an upper bound of probabilities and sizes of spills is estimated. The analysis results represent current traffic volumes and makeup of dangerous goods shipments. They do not reflect possible effects of future legislative, technological, and operations management changes that will undoubtedly aim at preventing and countering the effects of spills. Petrochemical products are the most likely spill commodity, and the potential size of a spill is similar for the two transportation alternatives. The return periods are orders of magnitude higher for the ferry than for the bridge. The return periods and sizes of spills can be improved by instituting traffic management systems for vessels and trucks. Bridge and waterborne emergency response, containment of spills in the bridge drainage system, and more stringent operating and maintenance procedures should reduce the volume of hazardous materials spilled into the water.

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 75-82
  • Monograph Title: Freight transportation: truck, rail, water, and hazardous materials 1991
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00620548
  • Record Type: Publication
  • ISBN: 030905124X
  • Files: TRIS, TRB
  • Created Date: Mar 31 1992 12:00AM