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Complete Streets are a planning and construction approach that designs for people walking, bicycling, taking transit, driving, and moving goods rather than optimizing a corridor for cars alone. They can be a bargain when a relatively modest, context-appropriate project prevents crashes and improves access, but the label is not a guarantee of low cost or automatic economic growth. A 2015 study of 37 projects found lower average costs than its comparison group and estimated $18.1 million in avoided collision and injury costs across the sample in one year. Those results are encouraging, not a universal price or return-on-investment promise. The practical test for a city or project owner is whether the proposed scope, baseline conditions, safety outcomes, maintenance obligations, and access benefits justify the local cost.
What are Complete Streets?
Complete Streets is a policy, planning, and design approach that considers the needs of all legitimate street users and adapts the design to local context. The U.S. Department of Transportation overview describes goals that can include safety, access, mobility, economic strength, public health, and environmental resilience. A neighborhood retrofit, a transit corridor, and a rural highway crossing may therefore look very different while following the same principle.
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There is no required “Complete Street” kit. A project might combine sidewalks, accessible crossings, bicycle facilities, bus stops, lighting, traffic-calming features, freight accommodations, drainage work, or a safer intersection layout. The Congressional Research Service primer emphasizes that policies should be interpreted with local street functions, users, and constraints in mind. Requiring identical elements on every road can waste money or create conflicts with emergency access, heavy vehicles, agriculture, or limited right of way.
Are Complete Streets worth the cost?
Often, yes—when the project addresses a documented safety or access problem and its scope matches the street. The strongest quantified evidence in the available data comes from a 2015 analysis, so it should be read as historical evidence about a sample, not as a current national cost estimate.
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| Finding | What the source reported | How to interpret it |
|---|---|---|
| Average project cost | $2.1 million for the Complete Streets projects versus $9 million for projects in state transportation improvement plans | Historical averages reported by the American Society of Landscape Architects from a 37-project study; not a like-for-like quote for a current project. |
| Cost per mile | 97% of sampled projects cost less per mile than an average high-cost arterial | A sample-specific comparison, reported in 2015; arterial scope and local construction prices vary widely. |
| Collision results | 70% of projects saw automobile collisions decline | An observed before-and-after result in the sample, not proof that every treatment lowers crashes. |
| Injury results | 56% of projects saw injuries decline | Useful evidence of potential safety value, with the same sample and study limitations. |
| Avoided collision and injury costs | $18.1 million across the sample in one year | Calculated by Smart Growth America for the projects as a group; it is not typical savings for an individual project. |
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The cost comparison and 97-percent statistic are summarized in the American Society of Landscape Architects account. The collision, injury, and avoided-cost figures come from Smart Growth America’s executive summary. All of these figures describe work and prices available to the 2015 study; inflation, labor markets, materials, utility conditions, and design standards make a fresh local estimate essential.
How much do Complete Streets projects cost?
There is no reliable single price. “Complete Streets project” can mean a restriping and signal-timing package, a sidewalk and crossing upgrade, or a full reconstruction with drainage, utilities, transit, landscaping, and new pavement. The $2.1 million average in the 2015 sample is best used to show that multimodal work does not have to be a megaproject, not to set a bid target.
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- Investigation and design: survey, traffic and crash analysis, geotechnical work, utility locating, accessibility review, public engagement, and permitting.
- Right of way: easements, property acquisition, temporary construction access, and relocation of utilities or signs.
- Street work: pavement, curb and gutter, drainage, medians, intersection geometry, crossings, and traffic-control equipment.
- Walking and bicycling facilities: sidewalks, ramps, detectable warnings, protected or separated bicycle space where appropriate, buffers, and crossing treatments.
- Transit and freight elements: bus stops, boarding areas, shelters, loading zones, turning space, and delivery access.
- Systems and finishes: signals, lighting, signing, markings, landscaping, stormwater features, inspection, and maintenance handover.
A low initial bid can be misleading if it excludes drainage, utility conflicts, right-of-way work, or long-term maintenance. Conversely, coordinating a sidewalk, utility, resurfacing, and signal project in one construction window can avoid repeated mobilization and future pavement cuts. The appropriate comparison is total cost over the same time horizon and for the same street function—not a Complete Streets label versus an unrelated road project.
Do safer streets save money?
They can. Crashes generate medical, emergency-response, property-damage, insurance, congestion, and lost-productivity costs in addition to human harm. In the 37-project analysis, Smart Growth America calculated $18.1 million in avoided collision and injury costs in one year across the sample. That aggregate result explains why a safety project may produce public value even when it does not generate direct revenue.
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The study also reported automobile-collision declines on 70% of projects and injury declines on 56%. Those percentages should not be treated as a guaranteed treatment effect: projects had different goals, designs, traffic conditions, and comparison periods. A credible local business case should document the crash baseline, define the post-construction measurement period, account for exposure such as traffic and population changes, and report serious injuries separately from minor incidents.
Safety savings are distributed broadly. A person who avoids a severe injury receives the largest benefit, while hospitals, emergency services, employers, insurers, and families may also avoid costs. Because these benefits do not all appear in a project budget, public agencies should state whose costs and benefits are included in an appraisal.
Do Complete Streets increase walking, bicycling, and transit use?
In the studied projects, walking, bicycling, and transit trips almost always increased. Automobile traffic changes varied because some projects were intended to calm traffic or shift trips, while others improved vehicle flow alongside multimodal access. The result is a reminder that mode outcomes depend on the project objective and surrounding network, not on the policy name alone.
Construction decisions influence whether the intended users can actually use the facility. Continuous accessible routes, crossings placed where people need to cross, winter maintenance, lighting, and clear separation from moving traffic can matter as much as the nominal width of a sidewalk or bike lane. Transit improvements also require a usable path from the stop to nearby destinations, not just a new shelter. Freight and emergency access should be modeled early so that safety features do not create avoidable operational conflicts.
Do Complete Streets increase business and property values?
The evidence is promising but not conclusive. A National Academies summary of the 37-project study reports that seven communities saw increased employment, six reported net new businesses, eight reported higher adjacent property values, and five reported additional private investment after projects. The summary also cautions that the sample was small and local economic data were incomplete or inconsistent, so the counts cannot establish that the street projects caused those outcomes.
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Several mechanisms are plausible: safer access can increase the number of people who reach a commercial area; reliable transit and walking connections can expand the labor pool; better loading and circulation can help deliveries; and a more attractive public realm can support investment. But business sales and property values are affected by rents, interest rates, land-use changes, anchor tenants, regional growth, and other public investments. A before-and-after comparison without a similar control area can mistake broader growth for a project effect.
Smart Growth America’s newer Complete Streets, Stronger Economies report provides a national landscape analysis and case studies discussing potential benefits such as sales, business growth, jobs, tax revenue, property values, and reduced crash and inactivity costs. Its existence supports careful economic evaluation, but the available summary does not provide a complete set of quantified estimates. Do not assign a national percentage or payback period without the report’s underlying methods and data.
How should an owner compare a Complete Streets option with another project?
Use the same context, scope, and time horizon for every option. A resurfacing-only alternative is not a fair comparator if the Complete Streets option also replaces utilities and rebuilds an intersection.
- Define the problem and users. Identify crash patterns, missing links, transit stops, freight routes, schools, businesses, people with disabilities, and seasonal conditions.
- Set a baseline. Record current construction condition, traffic and person-trip volumes, crashes and injuries, travel times, parking and loading activity, maintenance costs, and nearby economic indicators.
- Describe each scope completely. Include right of way, utility relocation, drainage, traffic control, temporary access, permits, contingencies, and operations after opening.
- Estimate costs on a common basis. Use the same price year, escalation assumptions, design life, and discounting method. Separate one-time capital costs from annual maintenance and replacement.
- Choose measurable outcomes. Track serious crashes and injuries, walking, bicycle and transit activity, automobile operations, accessibility, freight reliability, and construction disruptions.
- Plan the comparison period. Predefine when and how post-project data will be collected, and document unusual events such as a detour, major development, or transit-service change.
- Report distribution. Show which neighborhoods, businesses, travelers, and taxpayers receive benefits or bear costs. A project can be cost-effective overall while imposing burdens that require mitigation.
The American Planning Association’s Complete Streets: The Next Generation is a professional implementation resource, while the CRS primer provides policy context. Neither replaces a site-specific estimate or engineering review.
Which design and construction choices protect the bargain?
Cost discipline starts before detailed design. Match the treatment to the documented risk: a targeted crossing or signal change may solve a problem that does not require full reconstruction, while a corridor with failing drainage may justify coordinating underground work before paving. Reuse sound pavement and existing right of way where that can meet safety and accessibility requirements, but do not preserve a constraint that makes the facility discontinuous or dangerous.
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Coordinate agencies and utilities early. Conflicting records, late utility discoveries, and repeated traffic-control changes are common sources of claims and schedule growth on urban work. Establish who owns signals, lighting, landscaping, snow removal, sweeping, and pavement markings after completion. A design that is inexpensive to build but difficult to maintain can erase its value over time.
Construction phasing is part of the economic case. Keep businesses visible and reachable, provide an accessible temporary route, maintain emergency response, and publish loading and transit changes. Measure whether detours or closures are causing harm, then adjust staging where contracts and safety allow. These measures do not make a project “free,” but they protect the access benefits that justify the investment.
What are the main pitfalls?
- Using 2015 averages as today’s budget: historical sample costs are not current local prices.
- Equating correlation with causation: employment, sales, or property changes may reflect regional growth or unrelated projects.
- Counting only capital cost: maintenance, replacement, enforcement, snow operations, and accessibility repairs belong in life-cycle analysis.
- Comparing unlike streets: a neighborhood retrofit, high-cost arterial, and transit corridor have different functions and risk profiles.
- Ignoring people who do not drive: incomplete crossings or inaccessible sidewalks can leave the intended benefit unrealized.
- Assuming every mode must be maximized on every block: designs should reflect context, network connections, and safety rather than a checklist.
- Promising a payback period without data: the 37-project study does not support a universal return or schedule for economic benefits.
What would a defensible local business case contain?
A strong council, grant, or capital-program memo can be concise if it is transparent. Include a map and problem statement; alternatives and why they fit the street; a price-year cost estimate with contingencies; operating and maintenance costs; crash and access baselines; expected outcomes with measurement methods; construction-phase access plans; distributional effects; and risks such as right-of-way, utilities, drainage, permitting, and escalation. State which assumptions come from local data and which are transferred from published studies.
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Then explain uncertainty. The 2015 study’s 37-project sample is useful context, but its before-and-after data were available only for selected projects, and economic reporting was limited. A local agency can improve on that evidence by collecting consistent data before construction and at multiple post-opening intervals, publishing the comparison period, and revising forecasts when conditions change.
So, are Complete Streets a bargain?
Complete Streets can deliver substantial value for comparatively modest construction scopes, particularly when they prevent severe crashes, connect people to jobs and services, and coordinate work that would otherwise be repeated. The best available quantified sample found lower average costs and meaningful safety savings, while travel behavior generally shifted toward walking, bicycling, and transit.
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“Bargain” remains a qualified conclusion. Historical averages are not bids, the $18.1 million avoided-cost figure applies to a group of 37 projects, and evidence on jobs, businesses, property values, and private investment cannot prove causation. Treat Complete Streets as a way to frame a better project—and test that project with local costs, users, risks, and measured outcomes—rather than as a promise that every multimodal upgrade will be cheap or profitable.
Frequently Asked Questions
Can a small town use Complete Streets without rebuilding an entire road?
Yes. A policy can be applied through phased, lower-cost work such as accessible crossings, connected sidewalks, speed management, transit-stop improvements, or restriping where those treatments fit the documented problem. The town should still verify drainage, maintenance, emergency access, and accessibility before selecting a treatment.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchHow long should a city wait before judging a project’s economic effect?
There is no universal waiting period because construction disruption, seasonality, development cycles, and economic conditions differ. Establish preconstruction data and publish scheduled checks at multiple intervals, separating early access effects from longer-term business or property changes.
Who pays for maintenance after a Complete Streets project opens?
Responsibility depends on the agency, jurisdiction, and facility agreements. The project budget and handover documents should assign inspection, sweeping, snow and ice control, landscaping, lighting, signals, markings, and accessibility repairs, with recurring funding identified before construction.
Can Complete Streets designs accommodate delivery trucks and emergency vehicles?
They can when those movements are treated as design requirements from the beginning. Turning templates, loading locations, curb management, signal priority, and emergency routes should be checked against the proposed geometry rather than added after the pedestrian or bicycle elements are fixed.
