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Better traffic signals save time ... and can help save the planet
Image: INRIX
In February 2021, the United States officially rejoined The Paris Agreement, an international treaty on climate change, committing to reducing greenhouse gases (GHGs) by 50% below 2005 levels over the next decade. To meet these targets, the country needs to continue to reduce emissions 5% every…
October 25, 2021
A host of pilot programs underway in Austin, Texas, aim to improve roadway safety by leveraging high- and low- technology solutions. They are part of an effort to help Austin reach its goal of zero serious injuries and fatalities on the roadway—an initiative known as Vision Zero. Last month, TAPCO…
October 18, 2021
From its humble beginnings in 1963 with a $20,000 loan and a desire to deliver quality construction on alley and small street rehabilitations in Dallas, Texas, Ed Bell Construction has grown to a more than $100M company—in large part because of its commitment to staying on the leading edge of…
October 15, 2021
How the texture of a pavement surface contributes to the tire-pavement friction
Image: Hossein Roshani
Proper tire-pavement interaction is essential for the safety of motorists. Pavement surface texture is a major contributing factor to tire–pavement friction. Understanding the texture-friction relationship is valuable for transportation agencies, engineers, and contractors for proper pavement…
October 05, 2021
Sacramento SmaRT Ride vehicle
Sacramento SmaRT Ride vehicle. Image: Sacramento Regional Transit District
Microtransit is a form of transportation known as demand-response, in which customer demand determines the routes that are provided. Those routes can change, even as frequently as daily, to serve customer needs. In the era of COVID-19, as a result of reduced transit ridership as well as public…
April 10, 2021
It mystifies me that water services were being shut down in Texas after the pummeling deep freeze and massive snow engulfed much of the state.  What were these companies thinking? Sure, Texas is not generally prepared for these types of events, but those in charge of such services are still in…
March 04, 2021
The area south of Austin, Texas—near Buda—needed a faster route to reach State Loop 1 and downtown Austin. Drivers were using local roads as commuter corridors to access the major highways, which became increasingly congested. Concerned residents expressed their worry about the cut-through traffic…
March 04, 2021
We are in an unprecedented time in the history of our country. In a challenging environment like today, we need people with visionary ideas, like the Texas Central high speed rail project, to get us back on track. When did political leadership cease to celebrate ideas and projects that make our…
July 31, 2020
Wrong-way driving is an evergreen issue for transportation providers worldwide. Resulting crashes, while a small percentage of overall accident statistics, tend to be severe—head-on and at high speed.  In the Dallas/Fort Worth region, the North Texas Tollway Authority (NTTA) has been intensely…
July 14, 2020
The National Asphalt Pavement Association (NAPA) unveiled at a ceremony during the association’s 65th Annual Meeting in Maui, Hawaii, its annual Quality in Construction award winners.  As in years past, Roads & Bridges here brings you a look at some of the winners. Though NAPA bestows these…
March 02, 2020
For many bridge projects, particularly railroad bridges, time is of the essence and long periods of track outages are not an option. Therefore, accelerated bridge construction is an ideal method for many railroad bridge replacement projects. Accelerated bridge construction is a building method…
December 02, 2019
Using the handheld XRF instrument makes it possible to check the binder quality on the jobsite, which is a more efficient process than testing in the lab because using the benchtop XRF takes more time.
Using the handheld XRF instrument makes it possible to check the binder quality on the jobsite, which is a more efficient process than testing in the lab because using the benchtop XRF takes more time.
The paving industry routinely uses a variety of materials to produce and modify asphalt and seal coat binders. While many state DOTs adopted the Superpave performance grade (PG) binder specification (originally developed for unmodified asphalt binders under the Strategic Highway Research Program),…
July 03, 2019
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