Envision’s top award is called Platinum and it is earned at 50 percent. The Institute for Sustainable Infrastructure’s own 2018 guidance to the launch of version 3 sets the four award levels as percentages of applicable points earned: 20 percent for Verified, 30 percent for Silver, 40 percent for Gold, 50 percent for Platinum. A project that leaves half the available credit on the table takes the highest recognition the system offers.
This is not a criticism of Envision so much as the fastest route into what these systems are. None of the three that matter in American road work is a performance standard. Each is a menu of practices, a scoring convention, and an institution with a business model, and the differences between them sit in the third of those rather than the first.
Three owners, and three ways of paying for a score
INVEST belonged to the Federal Highway Administration. FHWA’s Transportation Planning Update newsletter for October 2012 describes it as a web-based collection of best practices and then more precisely as a voluntary self-evaluation tool. It had been public in beta since 2010 and then in a pilot test version, and version 1.0 was released on October 10, 2012. The same notice records something small and revealing: on release, all existing worksheets and scores generated by earlier versions were retired. Agencies that had scored themselves against the beta lost the score.
Envision belongs to the Institute for Sustainable Infrastructure, a nonprofit. Under the 2018 version 3 guidance, the framework itself was free to ISI members. Everything around it was priced, as the schedule below sets out.
Greenroads is operated by the Sustainable Transport Council, which describes itself as an independent nonprofit public benefit corporation and states that it is best known for its consensus-based, research-backed Greenroads rating system and rating program. Its offices are in Redmond, Washington. Alongside Greenroads it now carries the Greenrails and Greenmodes brands, and it runs membership, education and project rating as three separate programs, including a Sustainable Transport Professional credential examination. Its online store lists one publication, a 2019 edition of Greenroads Version 2, at $50.
Ownership shapes the failure mode more than any credit list does. A federally owned tool can be withdrawn when agency priorities move. A membership nonprofit has to keep selling credentials. A small independent body carries the risk that a single institution is the sole custodian of a rating system used on public projects.
What each one was built to look at
The scope differences are larger than the credit lists suggest, and they decide which system can answer which question.
INVEST spanned the asset’s whole timeline rather than a single design. FHWA’s 2012 description has it computing sustainability scores and tracking agency progress across three areas: system planning, project development, and operations and maintenance. That reach is what let it ask questions a project team cannot answer, and it is also why an INVEST score was not comparable between an agency scoring its program and a designer scoring a job.
Envision covers infrastructure of all types and sizes, not roads alone. ISI states that it is primarily used as a self-assessment tool, is meant to be applied in the early planning and design stages, and can also be used retroactively after construction to validate sustainable performance. Its 64 credits are organized in five categories, and each credit carries an intent statement, a metric, and up to five levels of achievement running from Improved to Restorative.
Greenroads is the roadway-specific instrument of the three, and the Sustainable Transport Council runs project rating as one of its three programs rather than as its only activity.
The denominator belongs to the applicant
Percentage thresholds sound stricter than point thresholds and are usually looser, because somebody has to decide what counts as applicable. A rural resurfacing has no credits available for brownfield reclamation or public space, so those points leave the denominator, and the project is scored against a smaller and easier version of the framework than an urban interchange faces.
That is defensible design. It is also the reason two Platinum awards are not evidence of comparable performance, and the reason a reader of any award should ask which credits were declared inapplicable before asking how many were earned. No published register answers that question for either system.
The version history shows the denominator moving as well. ISI’s guidance records Envision v2 as 60 credits totaling a maximum 809 points, and v3 as 64 credits totaling 1,000, with the fifth category renamed from Climate and Risk to Climate and Resilience. Eleven credits were new in v3, and the list of them is a fair summary of what the field had decided it was missing by 2018: two on construction safety and construction impacts, one on advancing equity and social justice, one on planning for sustainable communities, one on conducting a life-cycle economic evaluation, three on construction waste, energy and water, and three on risk and resilience. ISI’s own guidance stops at v3, so the credit counts and fee figures below describe that edition; where the framework goes next is taken up in what makes a highway sustainable.
Verification is the part that costs money
ISI published the v3 fee schedule alongside the framework, and it is the clearest statement available of what third-party scrutiny of a sustainability claim actually costs. Registration was $2,000 for any project. Verification was priced by project size and membership status, from $9,000 for a member taking the post-construction pathway on a project under $5 million, to $56,000 for a non-member taking the design-plus-post-construction pathway on a project between $500 million and $1 billion, with anything above $1 billion quoted individually.
ISI offered verification through two pathways. Design plus post-construction has verification happen at or after 95 percent design completion, followed by a mandatory post-construction review to confirm the commitments were carried through. Post-construction only skips straight to that review. The post-construction review is the part that distinguishes a promise from a delivered outcome, and under the first pathway it is required to keep the award.
Individual accreditation was priced separately. ISI’s 2018 schedule set the Envision Sustainability Professional training and examination fee at $250 for public sector participants and $700 for private sector, with annual credential maintenance requiring seven education hours and a renewal fee.
For a $30 million road project the schedule put verification between $21,000 and $30,000 depending on pathway and membership. That is a rounding error against the construction cost and a real line item against a design fee, which explains a good deal about which projects get verified.
Adoption evidence is thinner than any of the three would suggest
The most specific public figure for INVEST use comes from FHWA’s own research report FHWA-HRT-14-091, published in September 2014, which states that INVEST was being used by 29 agencies in 25 states and Washington, DC, including DOTs, metropolitan planning organizations, councils of government and public works departments. That is a real number with a date attached, and this publication has not found a later federal count.
For Envision and Greenroads, neither organization’s own material reviewed here carries a verified project count. Figures do circulate; they are not published by the bodies that would know, and a count assembled from third-party summaries is not evidence. The current numbers exist only at ISI and at the Sustainable Transport Council, and each of them can supply three different answers depending on whether the figure counts registered projects, verified projects, or projects that completed post-construction review.
What can be verified is that FHWA has stopped publishing its tool. Its Sustainable Highways Initiative page, updated in January 2026, is down to one sentence naming the triple bottom line as the thing the effort supports balanced decision-making about, and there is no instrument on the page at all. FHWA’s own pavement carbon methodology report from November 2021 still refers readers to INVEST for the social and economic factors that report excludes, which is a citation outliving the thing it cites. The program’s history is documented on this site at the INVEST archive, which holds no affiliation with FHWA.
Several agencies wrote their own instead
The quieter finding across all three systems is that state transportation departments have often preferred instruments they control. New York State DOT runs GreenLITES, which it describes as a transportation environmental sustainability rating program covering project designs together with operations and maintenance practices, awarding four levels: Certified, Silver, Gold and Evergreen, assigned on total credits received.
An agency-run program gives up external credibility and gains three things: no fee, criteria matched to its own specifications, and no risk that the custodian withdraws the tool. Given what happened to INVEST, that last consideration has turned out to be the substantive one.
What a score is good for
None of this makes the systems worthless. A credit list is a checklist of practices somebody thought through, and a designer working from one will consider stormwater, habitat connectivity and construction waste earlier than a designer working from a standard specification alone. The frameworks are useful as agendas. The measurements that survive a move from one project to another are the ones with units attached, of the kind embodied carbon accounting produces, and the wider argument about what any of it adds up to runs through the definition of a sustainable highway and more on sustainable infrastructure.
The mistake is treating a rating as a measurement. A score cannot be compared across projects because the denominator moves. It cannot be audited unless the verification pathway included a post-construction review. Envision sells one, and unless the applicant paid for it the score stays a self-assessment; INVEST never offered a review pathway at any price, which leaves it further from audit, not closer. And the one disclosure that would make any award checkable is the one nobody publishes, which is the list of credits a project declared inapplicable and the name of whoever agreed to it.