What is idling?

Key Takeaways

When a vehicle or equipment’s engine is running, but it’s not in motion or in use, it's in the state of idling. While some idling is unintentional and cannot be helped, prolonged idling can waste fuel, increase maintenance, cause pollution, and more. Learn more about vehicle idling, why it’s costly for fleets, anti-idling laws, and idle-reducing technologies in this guide.