Idle Reduction Benefits and Considerations

Reducing vehicle idling time saves fuel and money, cuts harmful emissions, and increases U.S. energy security. Decreasing idle time can also reduce engine wear and associated maintenance costs, especially for heavy-duty trucks.

Saving Fuel and Money

A photo of an open vehicle trunk with a black auxiliary battery pack inside.

Power for climate control and other essentials can be supplied by an auxiliary battery pack unit that fits neatly in a vehicle’s trunk.

Argonne National Laboratory estimates that more than one million long-haul heavy-duty trucks idle during required rest stops. As the trucks idle, they consume more than one billion gallons of fuel per year. In addition, thousands of work trucks idle to support jobs daily and millions of passenger cars idle waiting in traffic or pickup situations. Accounting for all road vehicles, from passenger cars to heavy-duty trucks, Argonne estimates that more than 6 billion gallons of gasoline and diesel combined are lost to idling every year. Even when fuel prices are as low as $2 per gallon, that wasted fuel translates into more than $11 billion annually—much of which could be saved with idle reduction technologies.

Cutting Harmful Emissions

Idle reduction strategies can reduce emissions of carbon dioxide, nitrogen oxides, carbon monoxide, particulate matter, and other harmful pollutants.

Idle reduction strategies also reduce noise pollution. In some areas, heavy-duty trucks and trains are required to limit noise at night. By adopting idle reduction strategies and technologies, drivers can comply with noise standards.

Increasing Energy Security

The United States imported 3% of its petroleum in 2019, and the transportation sector accounts for approximately 30% of total U.S. energy needs and 70% of U.S. petroleum consumption. Using idle reduction strategies to reduce fuel consumption continues to strengthen national security and reduce transportation energy costs for businesses and consumers.

Complying with Laws and Ordinances

Many states have idle reduction laws and incentives. In addition, many counties and municipalities have enacted idling restrictions. View Clean Cities IdleBase to access a database covering idling laws, from the local level to the state level spanning all types of on-road vehicles. For information specific to heavy-duty trucks, see the American Transportation Research Institute's Idling Regulations Compendium.