Monday, April 6, 2020 - 13:30
This handbook presents a methodology that will aid highway asset owners and maintenance personnel with determining what assets, beyond pavements and bridges, are most important to support their agencies' missions and goals. The methodology prioritizes asset classes and identifies data related to those assets that best support a performance-based approach to...
Monday, April 6, 2020 - 13:30
The Virginia Department of Transportation (VDOT) has purchased a subscription to the StreetLight (SL) Data products that mainly offer origin-destination (OD) related metrics through crowdsourcing data. Users can manipulate a data source like this to quickly estimate origin-destination trip tables. Nonetheless, the SL metrics heavily rely on the data points...
Monday, April 6, 2020 - 13:30
Our project was based on the need to water new roadside installations more efficiently to ensure that the turfgrasses, especially the new salt-tolerant mixes, establish more successfully with a predictable and uniform amount of water during the establishment period. The first objective of this project was to do a preliminary investigation of alternative means...
Monday, March 30, 2020 - 17:45
The Federal Highway Administration mandates that all [bridge] structures in its inventory are to be inspected every two years. Consequently, deck surveys are conducted to identify unseen damage within them. A significant number of bridges in Virginia have concrete decks with an overlay. Methods commonly deployed on these decks, are limited in the quantitative...
Monday, March 30, 2020 - 17:45
This paper performs an ex-post cost–benefit and distribution analysis of the Gothenburg congestion charges introduced in 2013, based on observed effects and an ex-post evaluated transport model. Although Gothenburg is a small city with congestion limited to the highway junctions, the congestion charge scheme is socially beneficial, generating a net...
Monday, March 30, 2020 - 17:45
To facilitate efficient pavement and bridge management programs, it is important to implement practices that measure and quantify roughness at bridge approaches. It is vital to establish standardized quality indices based on quantitative approaches. Engineers can use these indices to determine the condition of a particular bridge approach and subsequently...
Monday, March 30, 2020 - 17:45
This webinar, the fifth in the FHWA Sustainable Pavements webinar series, introduces key considerations and strategies for preserving and maintaining more sustainable pavements. The video is available at https://www.youtube.com/watch?v=k697UPMJ8uY
Monday, March 30, 2020 - 17:30
This study aimed to assess the impact of interacting with two infotainment systems, Android Auto and Apple CarPlay, on four driver performance measures: reaction time, driving behaviour, eyes-off road and self-reported performance. It also compared the results with other forms of driver impairment studied previously.
Twenty regular Android users took part...
Monday, March 30, 2020 - 17:30
Many intersections around the world are irregular crossings where the approach and exit lanes are offset or the two roads cross at oblique angles. These irregular intersections often confuse drivers and greatly affect operational efficiency. Although guideline markings are recommended in many design manuals and codes on traffic signs and markings to address...
Monday, March 30, 2020 - 17:30
More than 90 percent of highways and roads in the United States are built using hot-mix asphalt (HMA) or warm-mix asphalt (WMA) mixtures, and these mixtures now recycle more than 99 percent of some 76.2 million tons of reclaimed asphalt pavement (RAP) and about 1 million tons of recycled asphalt shingles (RAS) each year. Cost savings in 2017 totaled...
Friday, February 21, 2020 - 19:15
Moisture increase in pavement subsurface layers has an essential influence on granular material properties and affects expected pavement performance. Over time, moisture variations in the base layer of a flexible pavement depend on water infiltration after rain and pavement surface conditions. Consequently, the base layer resilient modulus (MR) is decreased...
Friday, February 21, 2020 - 19:15
From the work that has been performed in Phase 1 of the Ultra-Thin Bonded Wearing Course (UTBWC) Snow, Ice, and Wind Effects TRS, we understand that UTBWC pavement occasionally experiences negative pavement performance attributes in cold weather, requiring additional maintenance (beyond typical treatments) to remedy. Observations indicate a phenomenon of ice...
