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Asphalt Article May 05, 2015
Because of its many benefits, warm-mix asphalt (WMA) is becoming increasing popular with producers, paving crews and specifying agencies.   The goal with WMA is to produce mixtures with strength, durability and performance characteristics similar to or better than hot-mix asphalt (HMA) using lower...
Traffic Management Article May 05, 2015
Adaptive signal-control technology (ASCT) describes any system that collects traffic detector data, evaluates traffic-signal performance and then updates signal timing in response to that evaluation.   As part of the Every Day Counts initiative, the Federal Highway Administration (FHWA) actively...
News May 05, 2015
Congress has said you can forget about a gas-tax increase. Now, there is talk out of Washington that an increase of any kind is unlikely for the transportation sector.   The House and Senate Republicans agreed to a budget framework that would reduce highway and transit funding by 22%, which...
Article May 05, 2015
Non-recurring events, such as incidents, work zones and severe weather, have significant impacts on transportation systems. Agencies increasingly are applying operations strategies to lessen these impacts. And it is growing more and more critical that transportation agencies measure the results of...
Article May 05, 2015
Infrastructure changes often come in multiples, if for no reason other than that to alter or install one thing of major significance necessitates the alteration of all things associated with it.      The city of Toronto is undergoing a wide array of transit infrastructure changes under the...
Article May 05, 2015
As the world changes with the rapid advancement of connected devices and technologies, so must the transportation industry. In a business area where change is sluggish, DOTs across the country must adapt quickly to the evolving technologies that are going to impact their operations and budget.  The...
Highway Construction News May 05, 2015
There is a push in Washington state to finish the State Route 167 project. Washington state transportation officials consider the SR-167 Completion Project to be the critical missing link in the state's highway network.   The completion is expected to improve safety and reduce congestion along...
Article May 05, 2015
Concrete bridge structures are typically designed to last 50 to 75 years but seldom last half that time before rehabilitation is required due to degradation caused by corrosion of steel reinforcement.   Corrosion in commonly used epoxy-coated steel bars has raised both concerns regarding its use...
Bridges Article May 05, 2015
The Sellwood Bridge in Portland, Ore., is the community’s only crossing over the Willamette River for many miles in each direction. Thousands of motorists use the structure each day to travel between the city’s densely packed Sellwood and Westmoreland neighborhoods, making it the state’s busiest...
Bridges Article May 05, 2015
The Floating Bridge over Sunset Lake in Brookfield, Vt., has been a landmark for local residents for nearly two centuries—longer than state transportation agencies have existed and even before the invention of cars.   During winter months, residents near the lake would travel back and forth across...
Winter Maintenance Article May 04, 2015
The Idaho Transportation Department splits the state into six districts to make maintenance more manageable.   Each district can be vastly different from its counterparts in population, weather patterns and terrain. District 1 consists of the five northern-most counties and borders Washington,...
Winter Maintenance Article May 04, 2015
Snow and blowing snow conditions are major road transportation issues for many northern states and Canada. Keeping roadways safe and passable is a high priority and an unpredictable budget item of roadway-maintenance departments. In an effort to reduce costs while maintaining safe roadways,...
Winter Maintenance Article May 04, 2015
Operations workers know that the only constant in their world is change.   Most take pride in the fact they can react and adjust to changing conditions, changing requirements and changing response. Occasionally Mother Nature will throw a curveball, and standard response tactics are no longer...
Asphalt Article May 04, 2015
Since asphalt roadways began to appear in the U.S. in the mid-19th century, Americans have been seeking to enhance the quality of their roads.   Improved pavement performance has long been the goal of the modern asphalt industry. But even as pavement designs continue to advance, our highway...
Aggregates Article May 04, 2015
The use of warm-mix asphalt (WMA) has grown rapidly in the short time it has become a familiar acronym in the U.S. In fact, the Ohio Department of Transportation (ODOT) placed 2.8 million tons of water-injected WMA in 2011.   But, ODOT’s WMA work has not advanced without concerns, questions and...
Asphalt Article May 04, 2015
Thin-lift overlays are quickly emerging as a preferred alternative to other road-surface preservation treatments.   In Oregon, thin lifts are typically made up of 3⁄8-in. (9.5-mm) mix installed at a thickness of 1 to 1.5 in. These overlays are proving to be more economical than other surface...
Asphalt Article May 04, 2015
As the need grows for new rehabilitation methodologies to improve the performance of hot-mix asphalt (HMA) overlays on top of existing concrete pavement, saw and seal offers a cost-effective solution to the reflective cracking problem when properly constructed.   Reflection of cracks in HMA...
Asphalt Article May 04, 2015
Crack sealing has been used as a very cost-effective method of pavement preservation for decades.   Crack sealants reduce moisture and debris infiltration into the pavement structure, thereby, improving pavement performance.  During the life of most asphalt concrete pavements, overlays are placed...
Asphalt Article May 04, 2015
Around the country, agencies struggle with tight budgets and contractors struggle with unpredictable material prices in a competitive market.   This is not good for our nation’s highways—they continue to deteriorate—or for our economy. But it has had one benefit: It has created strong partnerships...
Asphalt Article May 04, 2015
NAPA is the trade association charged with representing the asphalt-pavement industry before the U.S. Congress and federal regulatory agencies. Our activities in Congress are guided by two principles: First, we support a robustly funded, multiyear highway bill; also, we act as our industry’s...

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