For what duration is bus idling often limited by law?

The duration for which bus idling is often limited by law is typically five minutes. This regulation is in place to reduce fuel consumption and minimize air pollution in urban environments, where buses frequently stop for loading and unloading passengers. Limiting idling to five minutes encourages more efficient operation of transit services and promotes better air quality for communities.

Laws regarding idle time may vary by jurisdiction, but the common practice of capping idling at five minutes stems from environmental concerns and aims to balance the needs of public transportation with the mitigation of emissions and noise pollution. This practice encourages bus operators to turn off engines during longer stops, which is beneficial for both the environment and economic efficiency.