D.C. launches five-site cool-pavement pilot to reduce urban heat
The District Department of Transportation has launched a five-site pilot applying solar-reflective pavement coatings at Washington locations designated as urban heat islands.
DDOT announced the Cool Corridors pilot on July 27, 2026, and said installation work began during that week. The project is a limited pilot at five sites, not a confirmed permanent citywide program.
The immediate change for people using or living near the selected locations is the installation of the pavement treatment. The District has not yet reported results showing whether the coatings reduce temperatures or affect heat-related health risks.
Testing reflective pavement at five sites
DDOT describes the material as solar-reflective cool pavement. The five sites were designated as urban heat islands, areas that the pilot is intended to address through a pavement-focused approach.
The agency says downtown Washington can run 10 to 15 degrees Fahrenheit hotter than nearby rural areas on summer afternoons. That stated temperature difference is part of the context for the District’s heat-resilience work, though it is not a projection of the temperature change expected at any pilot site.
DDOT’s available announcement does not identify all five locations in the indexed text. It also does not provide a budget for the work or a projected temperature reduction from the solar-reflective coatings.
Those limits matter in assessing what has been announced. The District has begun installing a treatment and established a plan to study it, but it has not presented completed performance findings from the five locations.
Part of a wider resilience study
The pilot is part of the broader Cool Corridors Multi-Hazard Resilience Study. DDOT is partnering on the effort with the Department of Energy and Environment, the Homeland Security and Emergency Management Agency, and the D.C. Department of Health.
That partnership places the pavement pilot within a District effort involving transportation, environmental, emergency-management and health agencies. The announced work, however, is specifically focused on applying coatings at the five designated sites and measuring conditions there.
The project is intended to address urban heat and support infrastructure resilience. DDOT has said the findings are intended to inform future District investments, but the announcement does not establish an expansion plan, identify additional sites, or set a timetable for a broader rollout.
Measurements and report due by year-end
American University will measure conditions before and after the coatings are installed. The before-and-after design is intended to provide a comparison at the pilot locations rather than a conclusion based only on the installation itself.
A comparative report is planned by the end of 2026. That report is the next known milestone for the pilot and is expected to provide the District’s stated comparison of conditions before and after the pavement work.
Until those measurements and the report are complete, the effect of the coating remains under evaluation. The available information supports that the five-site project is underway, but not a claim that it has already made neighborhoods cooler or lowered health risks.
For now, the scope is defined by five urban-heat-island sites, the solar-reflective pavement installation, the participating District agencies and American University’s planned evaluation. Future District investment decisions may be informed by the study’s findings, but no further action beyond the pilot has been specified.
Sources
- DDOT Launches the Cool Corridors Pilot to Fight Urban Heat, District Department of Transportation
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