The laws requiring drivers to get uninterrupted rest can interfere with anti-idling regulations. Most long-haul carriers are aware of anti-idling regulations and realize the benefits of idle reduction, including fuel savings, reduced maintenance and increased engine life. Yet, many fleets with sleeper trucks have not implemented sufficient idle reduction policies and technologies. Some fleets have tried one or more idle reduction approaches that provided inadequate performance, often leaving drivers uncomfortable and unrested. Fleets that have utilized diesel auxiliary power units (APUs) are incurring extra costs and downtime as a result of ever-increasing needs for diesel particulate filter (DPF) maintenance on the APU.