For much of the last century, many transportation systems were designed primarily to move vehicles as efficiently as possible. While mobility remains an essential goal, today's communities require transportation networks that serve a much broader range of users. Pedestrians, cyclists, public transit riders, motorists, emergency responders, and people of all ages and abilities all rely on the same infrastructure.
The Complete Streets approach recognizes that successful roadways should safely and efficiently accommodate everyone, not just drivers. By considering the needs of all users during planning, design, construction, and maintenance, Complete Streets help create transportation networks that are safer, more accessible, and better connected.
What Are Complete Streets?
Complete Streets is a transportation planning and design philosophy that prioritizes safe, convenient, and equitable access for all roadway users. Rather than applying a one-size-fits-all design, Complete Streets projects are tailored to the unique context of each corridor and the communities they serve.
Depending on the location and transportation needs, Complete Streets are designed to incorporate a wide range of features that support different modes of travel and improve overall usability. These may include sidewalks and accessible pedestrian routes that provide safe and continuous walking access, bicycle lanes or protected bike facilities that create dedicated space for cyclists, and public transit accommodations that improve access to bus stops and transit corridors. They may also include safe crosswalks and pedestrian refuge islands to improve crossing safety, traffic-calming measures that help manage vehicle speeds, accessible curb ramps that support ADA compliance, improved lighting and signage for visibility and wayfinding, and streetscape enhancements such as landscaping and street furniture that contribute to a more welcoming public environment.
The objective is to create roadways that improve mobility while supporting safety, accessibility, and community vitality.
Across the country, many cities are actively advancing this approach. For example, the Chicago Department of Transportation continues to implement an ongoing Complete Streets program focused on redesigning corridors to better serve all users. Through initiatives such as protected bike lane expansion, pedestrian safety improvements, transit priority enhancements, and neighborhood street redesigns, CDOT is working to create a more balanced and multimodal transportation network that reflects the needs of Chicago’s diverse communities.
Improving Safety for All Users
Safety is one of the primary reasons communities adopt Complete Streets principles. Traditional roadway designs often focused on vehicle throughput, sometimes overlooking the needs of pedestrians and cyclists.
Complete Streets incorporate design features that can help reduce conflicts between users by shortening pedestrian crossing distances, improving visibility at intersections, slowing vehicle speeds where appropriate, providing dedicated space for cyclists, and enhancing accessibility for people with disabilities. By designing transportation systems that account for multiple travel modes, engineers can create environments that are safer and more predictable for everyone.
Supporting Mobility and Accessibility
Every community has diverse transportation needs. Some residents commute by car, while others rely on public transit, bicycles, or walking. Older adults, children, and individuals with disabilities may also require different infrastructure features to travel safely.
Complete Streets support these varied needs by improving connections between neighborhoods and destinations, expanding access to schools, parks, and healthcare facilities, enhancing transit accessibility, strengthening first-mile and last-mile connectivity, and improving mobility for users of all ages and abilities. Providing transportation choices allows communities to better serve residents with different lifestyles and travel preferences.
Strengthening Communities and Local Economies
Transportation infrastructure shapes how communities develop and interact. Streets that are comfortable for walking, cycling, and transit use often encourage greater activity in nearby business districts and public spaces.
Complete Streets can contribute to increased support for local businesses, enhanced public spaces, improved neighborhood connectivity, higher-quality streetscapes, and greater community engagement. By creating more inviting and accessible environments, transportation projects can strengthen both economic activity and community identity.
Environmental and Long-Term Benefits
Complete Streets also support broader sustainability and resilience goals. By encouraging multiple transportation options, communities can reduce dependence on single-occupancy vehicle travel while improving overall transportation efficiency.
Potential long-term benefits include reduced traffic congestion, lower vehicle emissions, improved air quality, increased opportunities for active transportation, and more resilient transportation networks. These outcomes help communities prepare for future growth while supporting environmental stewardship.
The Engineer's Role
Designing a Complete Street requires careful planning and collaboration. Civil engineers evaluate traffic operations, roadway geometry, drainage, utilities, safety performance, accessibility requirements, and community priorities to develop solutions that balance competing needs.
Successful projects often involve coordination with transportation agencies, local governments, transit providers, community organizations, utility companies, and residents and business owners. Every corridor presents unique challenges, making stakeholder engagement and context-sensitive design essential components of the planning process.
Building Streets That Serve Everyone
Transportation infrastructure has a profound impact on how people experience their communities. Roads are shared public spaces that connect people to jobs, schools, businesses, healthcare, recreation, and one another.
Complete Streets reflect a broader vision for transportation, one that values safety, accessibility, mobility, and community well-being equally. By designing roadways that accommodate all users, engineers help create transportation systems that are more inclusive, resilient, and responsive to the evolving needs of the communities they serve.