are all covered within the RDM. The manual is also utilized by county public works departments in their own roadway design and construction projects.
Additionally, the RDM includes design standards for pedestrian and cyclist
rights of way, and the management of pedestrian and cyclist movement alongside motor vehicles, and across motor vehicle rights of way. These standards include signage for shared use paths, recommended shoulder widths to accommodate cyclists, and guidelines for reconstructing roadways to enhance pedestrian safety.
What is the HCM?
The Highway Capacity Manual (HCM) has been a primary resource for nearly 60 years for measuring roadway capacity, or the degree to which roadways meet traffic demand. In addition, the HCM provides tools to gauge how transit, pedestrian, and bicycle demand impacts the quality of service of roadways and their ability to provide efficient and safe transportation.
The manual addresses traffic congestion by offering a way to quantify congestion and highway operations so that conditions can be clearly understood and effective solutions can be developed. To keep pace with changing travel characteristics and improvements in capacity analysis, the HCM has been updated several times since its first