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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
Sixth Street Viaduct
Sixth Street Viaduct photos courtesy of Gary Leonard
SIXTH STREET VIADUCT Los Angeles, California By Nader Naderi, P.E. and Karen Cormier, P.E. During its 84-year lifespan, concrete elements of the now-demolished Sixth Street Viaduct cracked and deteriorated due to an internal chemical reaction known as alkali silica reaction (ASR), which is caused…
June 07, 2019
In an effort to inform traffic performance management, operations and planning using big data, the Federal Highway Administration provides access to fine-resolution travel-time data to state agencies and metropolitan planning organizations (MPOs). The National Performance Management Research Data…
April 09, 2019
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