The Highway Capacity Manual, 6th Edition

摘要

The first edition of the Highway Capacity Manual (HCM), published in 1950, aimed to provide "a practical guide by which the engineer, having determined the essential facts, can design a new highway or revamp an old one with assurance that the resulting actual capacity will be as calculated" (1). The 1965 edition introduced the concept of levels of service (LOS) based on a selected performance measure, such as traffic speed or density (2).