Case Studies

3m wet reflective paint
Michigan’s Department of Transportation (MDOT) had been using wet reflective optics in its permanent pavement markings on certain larger construction projects for years when officials decided to establish a standard to require full wet reflectivity in its work zones. MDOT wanted to increase safety...
St. Louis sewer district relies on manhole risers
With a population of about 320,000, St. Louis is the 60th-largest city in the United States. But due to an unusual arrangement, St. Louis, its metro area (which has a population of approximately three million), and the surrounding St. Louis County (which has a population of approximately one...
Corroded culvert
In January 2016, the Colorado Department of Transportation (CDOT) placed a project for public bid which included repair of several large-diameter highway culverts and a single box culvert. CDOT had specified a spray-applied culvert lining under a special revision to Section 603 of their standard...
bridge beams that stretch over I-65 and across Lick Creek
The I-465/I-65 highway interchange project is a major undertaking in Indianapolis that includes $19.6 million in bridge replacements. With jobs this big, having the right-size, right-price equipment is vital to keeping budgets on track without sacrificing quality and safety. This is precisely why...
American Highway Products’ (AHP) Pivoted Turnbuckle Manhole Riser
Fairhope is a small city, just 15,000 residents, situated on the cliffs and shoreline of Mobile Bay in Alabama’s Gulf Coast. It can seem like Fairhope is a long way from anywhere, but people seem to like it—the city has been named one of the best small towns in the South by Southern Living magazine...
IDOT TRS developmental layout specification (as shown as Figure 4 in the Report).

IDOT TRS developmental layout specification (as shown as Figure 4 in the Report).

The Center for Transportation Research and Education (CTRE) at Iowa State University develops methods and technologies to improve transportation safety and reliability.   Last month, CTRE issued a Final Report titled “Field Measurements on the Effect of Temporary Rumble Strips in Work Zone Flagging...
Erie County on I-90 westbound
Pennsylvania Department of Transportation (PennDOT) District 1 is responsible for over 3,600 road miles and more than 2,000 bridges. Thanks to severe winter weather and lake effect snow conditions, this region is perhaps the most challenging area for maintenance of all the PennDOT districts. The...
Massive waves deteriorated the shoreline and a portion of the road
During the fall of 2016, a particularly bad storm hit a shoreline road in Gisborne, New Zealand. Monstrous waves slammed into the shoreline slope, which eroded away due to oversaturation and lack of foundational support. The erosion washed away part of the slope and took a portion of the road with...
Teodoro Moscoso Bridge
The Teodoro Moscoso Bridge is the longest bridge spanning a body of water in Puerto Rico. The four-lane, 1.4-mile-long toll bridge spans the San José Lagoon, connecting the cities of San Juan and Carolina while also serving as the main entrance to the Luis Munoz Marin International Airport. The...
City of Fargo, N.D., prioritizes safety with systematic approach to durable pavement markings
Winters in the Midwest can be harsh, especially on the roads. As roads age and are exposed to the elements, the striping that delineates lanes tends to fade first. Creating a systematic approach to maintaining road markings is important, but many cities overlook this and may not budget for it. In...
Manhole risers, safety ramps help Chicago maintain streets, reduce lane closure times
In July 2000, the Illinois Department of Transportation (IDOT) sent a letter to Scott Fier, president of American Highway Products, approving the use of his company’s adjustable riser rings when raising utility and manhole rims to grade after pavement lifts. Formal language describing acceptable...
Cranes at center of I-4 widening project in Florida
Widening a highway includes widening and replacing bridges, and for that, cranes are in high demand. Florida’s I-4 corridor, an east-west expressway that connects Daytona with Tampa, is undergoing an ambitious five-year, $2.3 billion widening project that will expand the expressway from four lanes...
The Gulfport-Biloxi International Airport, Snap-Tite pipe system
The Gulfport-Biloxi International Airport in Gulfport, Miss., was undertaking an airport improvement project that included repairing, repaving, and adding new runways and taxiways. As part of this improvement project, the airport discovered several aging and deteriorating drainage culverts under...
Single-blade spec applied to concrete surface saves costs on WSDOT floating bridge project
The Evergreen Point Floating Bridge, also known as the 520 Bridge or its official name of the Governor Albert D. Rosellini Bridge, spans Lake Washington from Seattle to Bellevue and was replaced in 2016. The new bridge is certified by the Guinness Book of World Records as the longest and widest...
XL 5100 IV Gradall excavator
Green Diamond Resource Co. is a fifth-generation, family-owned forest products company—a major timber supplier of power poles and various specialty products, as well as logs for sawmills.   Based in Shelton, Wash., the company relies on its efficiency in growing and harvesting timber on 1 million...
Rebuilding a major road in India with a geocell flexible pavement
Major District Road (MDR) 31 passes through Shaha and Kolpewadi villages in Sinnar Taluka, part of District Nashik in India’s Maharashtra state. Overseen by the Nashik Public Works Department (PWD), the road provides an important link between sugarcane farms and sugar mills in the area. During peak...
BoardWalk ramps were installed on both sides of Superior Avenue
With a deadline approaching, one backed by a very large fine if it were missed, officials of the city of Cleveland, Ohio, recently reopened the part of Superior Avenue that runs through Public Square downtown.   The following timeline is an overview of the circumstances that led to the reopening of...
Steel barrier system saves lives on Indiana highway
Highway work zones are hazardous, both for drivers who must maneuver through traffic control arrangements and for construction workers who operate steps away from passing vehicles. In this environment, a split-second distraction or unexpected incident can have grave consequences. To prevent serious...
Inclined catch basin risers saved 400 man-hours
Asphalt overlays are one of the most common and well-studied roadway projects, so innovation seems unlikely, especially the kind of new idea that saves significant time and money without a major capital investment. But Rowe Construction, an Illinois paving firm, recently saved about 400 man-hours...
Gravity walls were installed with minimal excavation on Slayton Hill Road
When a road turns into a raging river, it becomes both dangerous and damaging. This is exactly what happened in July 2013, when the city of Lebanon, N.H., was swamped with more than 4 in. of rain within 48 hours—2 in. fell in just 45 minutes. The deluge caused flash flooding, which left residents...
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