OffPeak provides an incentive for cargo owners to move cargo at night and on weekends, in order to reduce truck traffic and pollution during peak daytime traffic hours and to alleviate port congestion.
Since July 2005, all marine terminals in the Ports of Los Angeles and Long Beach have offered OffPeak shifts on nights and weekends. As part of the program, a Traffic Mitigation Fee is required for cargo movement through the ports during peak daytime hours, with certain exceptions.