MDOT briefs House committee on construction specs, contractor prequalification, bond spending and truck-weight policy

Greg Brenner, chief operations officer for the Michigan Department of Transportation, and Patrick McCarthy, MDOT bureau director for finance and administration, briefed the House Transportation Infrastructure Committee on MDOT construction standards, contractor prequalification, construction bonding and truck-weight policy.

Brenner said Michigan has about 256,000 lane miles of road and nearly 12,000 bridges. He described MDOT's standard specifications — a consolidated specification “book” updated periodically and used by MDOT and many local agencies — and said the specifications align with Federal Highway Administration requirements and AASHTO guidance. "This book's broken down into about 10 different sections," he said, listing areas such as bridge work, drainage, concrete and asphalt pavements, and maintenance of traffic.

Brenner described several technical practices MDOT uses: mechanistic-empirical pavement design (ME), a life-cycle cost analysis that state law requires for projects with more than $1.5 million in pavement costs, alternate-payment bids when life-cycle costs are close, capital preventive maintenance (CPM) and warranties. He said CPM projects covered about 2,600 miles of treatments in 2024. On warranties, he said Michigan has two types — performance warranties for smaller projects and materials-and-workmanship warranties for larger rehabilitations — and that warranty requirements stem from laws established in 1997 and updated in 2015.

On quality oversight, Brenner detailed MDOT's quality-assurance and certification programs for testing asphalt, concrete and aggregates; he also outlined material research programs and innovations such as warm-mix asphalt, use of allowed byproducts in pavements, longitudinal joint density specifications, and concrete testing using the super air meter.

Patrick McCarthy summarized the contractor and consultant prequalification process, required by Title 23 of the Code of Federal Regulations for construction contractors, and noted MDOT currently has "a little over 600 prequalified contractors" and 133 prequalified consultants. McCarthy said construction contract awards totaled about $2 billion to $2.5 billion in 2022–23; MDOT had awarded about $1.3 billion in construction contracts so far in fiscal 2025 and awarded 450 construction contracts to date in the year (563 in fiscal 2024). Consultant awards were about $439 million in 2022 and about $216 million so far in fiscal 2025.

On bonding and the Rebuilding Michigan bond program, McCarthy said the authority included $3.5 billion in authorization; MDOT has issued $2.8 billion of that authorization and had roughly $700 million of authorization remaining. He said the third tranche began at $1.4 billion and about $600 million of that round remained at the time of testimony.

On truck weights, Brenner explained federal law sets an 80,000-pound gross vehicle weight standard on interstates, but Michigan allows higher gross weights in many cases by spreading load across more axles, which reduces per-axle loads. He said heavy gross loads are accompanied by lower axle loads and that the very heaviest trucks represent a small share of traffic. The department and committee discussed frost-law spring restrictions and how freeze–thaw cycles influence damage and permit periods.

Committee members asked about warranty claims, tire- and shingle-derived materials, bridge bundling, detour and local-road impacts during interstate closures, and enforcement coordination with Michigan State Police. McCarthy and Brenner offered to provide follow-up information, including warranty reporting details and additional bonding and permit data.

No committee votes on MDOT policy or bond authorizations were recorded in the transcript excerpt; the session consisted of briefing and questions.