WSDOT publishes roadside safety design, including design for traffic barriers, impact attenuators, and rumble strips. State roadside safety policies are covered in Division 16 of the Design Manual.
- Chapter 1600, Roadside Safety
(pdf 678 kb)
This chapter addresses the area outside of the roadway and is an important component of total highway design. Guidance on roadside safety issues is presented in this chapter.
- Chapter 1610, Traffic Barriers
(pdf 1.2 mb)
This chapter includes traffic barriers, terminals and transitions that are approved for use by WSDOT.
- Chapter 1620, Impact Attenuators
(pdf 1.8 mb)
This chapter describes the impact attenuators that are approved for use by WSDOT.
The SCI 100 GM Smartcushion was the first MASH compliant Type 31 impact attenuator on the WSDOT QPL. Read more about impact attenuators.