Pilar Londoño, M. del

border trade mexican mexico state truck laredo broker nafta bridge inspection custom system trucking country transportation percent problem process carrier transport service model vehicle product point border crossings information driver mexican brokers interest entry shipment crossing government infrastructure drayage barrier industry export table promotor scenario figure freight effect canada analysis cargo world trade bridge congestion mexican broker equipment value research study price market import inefficiency change business shipper trade flows company operation trailer group delay tariff chapter laredo border traffic practice number world impact factor agency region