Mercredi, 3 Août, 2016 - 15:15
This synthesis from Transportation Research Board documents the state-of-the-practice on how the transportation community is protecting roadways and mitigating damage from inundation and overtopping. This report highlights major issues and design components specific to roadway embankment damage from flooding. It documents the mechanics of damage to the...
Vendredi, 8 Juillet, 2016 - 15:15
Potholes are a major problem in many parts of the world. This guide sets out the principal options for repairing potholes before describing a procedure for selecting an appropriate option for different situations using a series of flowcharts. There are default values for the various questions asked in the flowcharts, but other values can be used to reflect the...
Mardi, 5 Juillet, 2016 - 14:45
Traffic control devices, such as rectangular rapid-flashing beacons (RRFBs), have been shown to increase the number of drivers yielding to crossing pedestrians. This TechBrief describes the methodology and results from an open-road study sponsored by FHWA that examined driver yielding behavior at crosswalks with RRFBs positioned above the pedestrian crossing...
Mercredi, 22 Juin, 2016 - 18:00
From 2006 to 2014, ten right‐turn approaches in the Peoria, Illinois, area were selected and reconstructed with a modified right‐turn lane design. The major purpose of the modified design was to improve the line of sight for passenger vehicles attempting to turn right, while also accommodating semi‐tractor trailer trucks. While the actual changes varied among...
Mercredi, 22 Juin, 2016 - 18:00
This US TRB report evaluates and assesses existing guidelines for the design, installation, monitoring, and maintenance of environmentally sensitive stream bank stabilization and protection measures, and develops quantitative engineering design guidance for selected treatments. Updated design guidelines for three widely used treatments are presented: live...
Mercredi, 22 Juin, 2016 - 18:00
Bridge performance measures are important components of any successful Bridge Management System. Different types of performance measures have been developed for various purposes. The types of performance measures are usually a reflection of an agency’s goals. The bridge health or condition index is a type of performance measure used by agencies interested...
Mercredi, 22 Juin, 2016 - 17:45
When more cyclists turn to the roads in Oslo each spring, the risk for each cyclist of being involved in a conflict or near miss is reduced. In other words, there is proof of a Safety in Numbers effect. Comparing Norwegian road users with their Danish and Swedish counterparts shows that this effect can either be accentuated or reduced by differences in...
Jeudi, 12 Mai, 2016 - 13:45
This TRB report documents the state of the practice of life-cycle cost analysis (LCCA) and risk-based analysis into state highway agencies' asset management plans for pavements and bridges on the National Highway System. The objective of this project was to develop an inventory of quantitative asset-level, project-level, or corridor-level processes and...
Vendredi, 29 Avril, 2016 - 14:30
This literature review on the effect of electronic device use on pedestrian safety is part of a research project sponsored by the Office of Behavioral Safety Research in the National Highway Traffic Safety Administration (NHTSA). An extensive literature review was conducted and summarized into three sections: pedestrian distraction, driver distraction, and...
Lundi, 25 Avril, 2016 - 20:00
This synthesis documents transit agency parking policies and parking management at transit stations using three primary resources: a scan of current research on transit-supportive parking policies, an original survey distributed to a sample of transit agencies, and several brief agency profiles based on interviews and existing available data. The survey was...
Vendredi, 22 Avril, 2016 - 20:00
The Iowa Department of Transportation (DOT) is responsible for approximately 4,100 bridges and structures that are a part of the state’s primary highway system, which includes the Interstate, US, and Iowa highway routes. A pilot study was conducted for six bridges in two Iowa river basins—the Cedar River Basin and the South Skunk River Basin—...
Lundi, 18 Avril, 2016 - 15:00
This report summarizes all activities completed to backcalculate the elastic layered modulus from deflection basins measured on all test sections included in the LTPP program. Specifically, the report documents the tools, data analyses, backcalculation and forward calculation packages, and procedures used to calculate, on a production basis, the in-place...
