Union warns of drug-taking truckers, unsafe rigs on planned trade routes. The NAFTA superhighway, a north-south interstate trade corridor linking Mexico, Canada and the U.S., would mean U.S. truckers replaced by Mexicans, more unsafe rigs on American roads and more drivers relying on drugs for their long hauls, charges the International Brotherhood of Teamsters – the latest group to weigh in against the Bush administration plan. The August issue of Teamster magazine features a cover story on the plan for an enlarged I-35 that will reach north from the drug capital border town of Nuevo Laredo, Mexico, 1,600 miles to...