WSDOT considers many factors to evaluate on all projects, including SR 900. Some of these include:
- Accessibility for pedestrians, bicyclists and transit users, including how comfortable and user-friendly sidewalks and shared-use-paths are for people who bike, walk or roll to travel SR 900
- Making sure traffic flows well for all types of vehicles, including trucks that carry goods
- Following all federal and state design standards
- Minimizing right-of-way impacts and needs
- Slowing down drivers by changing the street to feel more like a place where people live and walk. This includes things like making lanes narrower, adding space between cars and the shared use path, building more crosswalks and extending curbs to shorten crossing distance.

- Minimizing the environmental impacts of the proposed designs.

- Assessing how complex the construction of the proposed designs is, such as the amount of retaining walls needed, drainage relocation, etc.
