G3 F7—An Expanded LOS Gradation System

摘要

Expanding the level-of-service criteria by adding additional levels is needed to quantify existing conditions. A system that addresses existing and future congestion is needed because: 1. Intersection, arterial and freeway service LOS F does not quantify congestion for existing or future conditions. 2. Increased congestion beyond LOS F is accepted in certain situations but not quantified. The technical ability to measure LOS in terms of modeling and making field measurements has increased dramatically, providing the capacity to quantify additional levels for less cost in less time than 30 years ago. 3. LOS F doesn't play the significant part that our measuring system should in choosing where major improvements are needed such as rail, increased total safety management, or major corridor improvements.