The complexity of transportation design requires the designer to make fundamental trade off decisions that balance competing considerations. Although weighing these considerations adds to the complexity of design, it accounts for the needs of a particular project and the relative priorities of various projects and programs. Improvements must necessarily be designed and prioritized in light of finite transportation funding.
This Design Manual is a guide for our engineering personnel. It provides
policies, procedures, and methods for developing and documenting the design of improvements to the transportation network in Washington State. The manual supplements the engineering analyses and judgment that must be applied to improvement and preservation projects. It provides uniform procedures for documenting and implementing design decisions.
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