Lundi, 30 Mars, 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...
Lundi, 30 Mars, 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...
Lundi, 30 Mars, 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...
Lundi, 30 Mars, 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
Lundi, 30 Mars, 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...
Lundi, 30 Mars, 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...
Lundi, 30 Mars, 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...
Vendredi, 21 Février, 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...
Vendredi, 21 Février, 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...
Vendredi, 21 Février, 2020 - 19:15
The existing online mapping systems process many user route queries simultaneously, yet solve each independently, using typical route guidance solutions. These route recommendations are presented as optimal, but often this is not truly the case, due to the effects of competition users experience over the resulting experienced routes, a phenomenon referred to in...
Vendredi, 21 Février, 2020 - 19:15
This study developed a number of models to estimate the relationships between land use, transit ridership, household expenditures, and municipal spending, with a focus on small urban areas. First, a regression model was developed that estimated transit ridership in small urban areas as a function of service quantity, service characteristics, the unemployment...
Vendredi, 21 Février, 2020 - 19:15
This project refined the Natural Resources Research Institute’s (NRRI's) patented taconite-based repair compound, explored equipment options, and field tested/demonstrated a low-cost mechanized system that can efficiently mix and place the repair compound in larger quantities while minimizing or eliminating direct contact and hand mixing by...
