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Trailer makers are troubled by the Phase 2 proposal on greenhouse-gas emissions, with some asserting the agencies involved exceeded their regulatory authority and others arguing the mandates are overly aggressive and based on faulty assumptions.

The U.S. Environmental Protection Agency said Volkswagen cheated on air-pollution rules for its diesel cars with a defeat device, reminiscent of 1998 when heavy-duty truck manufacturers were doing the same thing.

HEYBURN, Idaho — Volvo Trucks rolled out a drivetrain system that management hopes will give the company a larger presence among liquid and bulk haulers, regional distribution carriers and trucking companies often dealing with loads that diminish over time or with empty backhauls.

Roughly one in three U.S. motorists expect to drive more in August as low gasoline prices help fuel optimism for the broader economy, a new retail survey released on Aug. 11 shows.

WASHINGTON — A small change in the limit for ground-level ozone emissions could lead to wide-scale noncompliance of environmental rules and could lead to the federal government’s yanking funding commitments for infrastructure projects, business groups said.