Level of Service (LOS) (LOS)

A qualitative measure describing operational conditions within a traffic stream in terms of speed and travel time, freedom to maneuver, traffic interruptions, comfort and convenience, and safety. Level A denotes the best traffic conditions while Level F indicates gridlock. An Environmental Impact Report (EIR) for a development proposal evaluates the impact the development will have on the LOS standards for police, fire, utilities, parks, schools and traffic in the effected area.