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Highway Design Manual (HDM) The 7th Edition Highway Design Manual (HDM) establishes uniform policies and procedures to carry out the state highway design functions of the California Department of Transportation.
The HDM is the primary source of guidance for detailed highway design. It is also frequently referred to in the scoping stage and preliminary design phase and occasionally referred to for some construction issues.
The Connecticut Highway Design Manual has been developed to provide uniform design practices for preparing roadway plans. The Manual presents most of the information normally required in the design of a typical highway project. The highway designer should attempt to
Design Procedures Guide. The Design Procedures Guide provides basic guidance, recommended procedures, and instructions for developing and documenting the highway design.
This chapter provides guidance regarding the basic elements of highway design to designers and other project developers. The information presented is not all-inclusive, but must be used in conjunction with information found in other chapters of this manual and documents adopted by
9.1.2 - Design Requirements and Standards. 9.1.3 - Exceptions to Design Standards. 9.1.4 - Variances to FLH Standard Practice and Guidance. 9.1.5 - Design Philosophy and Context Sensitive Solutions.
Chapter 7 of the Highway Design Manual provides guidance on the issues that NYSDOT designers should take into consideration when engineering judgment is applied to 1R, 2R, and 3R projects.
Sight distance is the continuous length of highway ahead, visible to the highway user. Four types of sight distance are considered herein: passing, stopping, decision, and corner. Passing sight distance is used where use of an opposing lane can provide passing opportunities (see Index 201.2).
Title 23 USC 109 provides that projects (other than highway projects on the NHS) shall be designed, constructed, operated, and maintained in accordance with State laws, regulations, directives, safety standards, design standards, and construction standards.
Selecting the design speed for a highway is part of the Project Development Team process. See the Project Development Procedures Manual for additional guidance.