Lundi, 24 Janvier, 2022 - 16:00
During the winter season, snowmobile riders in many jurisdictions use trails that are usually managed and maintained by snowmobile clubs and associations. The problem lies when these trails intersect with vehicular highways or paved park trails owned and maintained by a public agency. A single crossing can see thousands of snowmobiles in a single season, which...
Lundi, 24 Janvier, 2022 - 15:45
Public agencies benefit from measuring their performance as it helps to focus employee and organizational activities. State departments of transportation have become more performance-oriented over the past two decades and routinely collect data on highway safety, infrastructure condition, system operations, project delivery, winter maintenance, transit, bicycle...
Lundi, 17 Janvier, 2022 - 15:45
Traffic speed deflection devices (TSDDs) are designed to measure pavement deflections or deflection velocities in response to loads applied by trucks moving at or near prevailing traffic speeds.
TRB's Transportation Research Circular E-C276: State Departments of Transportation Experiences and Applications with Traffic Speed Deflection Devices details a...
Lundi, 17 Janvier, 2022 - 15:30
The ultimate objective of this project was to determine the structural performance of the dynamic message sign (DMS) bonded with chemical adhesive in terms of ultimate strength and fatigue strength. To achieve this objective, this project first investigated the effects of various parameters (i.e., conditioning humidity and conditioning temperature) on tensile,...
Lundi, 17 Janvier, 2022 - 15:30
This project investigated the influence of intersection corner radius on pedestrian crashes and right-turn vehicle speed. The corner radius can be unique to each corner at an intersection; therefore, this study assigned crashes to an intersection corner rather than to the entire intersection. For corner-level pedestrian crashes, the following variables were...
Lundi, 17 Janvier, 2022 - 15:15
During the last 20 years, the Federal Aviation Administration made significant efforts to develop one of the most comprehensive specifications to prevent alkali-silica reaction (ASR) in new construction [see the Advisory Circular (AC) 150/5370-10H, Item P-501]. The AC was effective, to a large extent, in preventing ASR in new airport pavements during the last...
Lundi, 17 Janvier, 2022 - 15:15
The Federal Highway Administration (FHWA) Roadway Safety Data Program is working with State and local agencies to develop case studies around roadway safety data collection, management, and analysis issues. These case studies help illuminate both the challenges that agencies encounter on data issues and the solutions they are implementing to address those...
Lundi, 10 Janvier, 2022 - 15:45
As of January 1, 2021 the City of Chicago has 162 automated speed enforcement cameras deployed at 69 child safety zones with 96 cameras enforcing speed in one direction of travel, and 66 cameras enforcing speed in both directions of travel. 85 cameras were deployed at 40 park zones; 77 cameras were deployed at 29 school zones. For this analysis, two single-...
Lundi, 10 Janvier, 2022 - 15:45
Geogrids have been widely used in roadway construction as reinforcement in pavement foundations. Geogrids have been effective in practice for reducing rutting damage, distributing traffic loads within the pavement foundation layers, increasing the resilient modulus of the base course, and stabilizing the subgrade layer. For this project, an integrated mobile...
Lundi, 10 Janvier, 2022 - 15:45
Alternative intersection designs can improve traffic operations and safety but may be confusing to drivers due to turn prohibitions at intersections, such that drivers may be unaware where they can make a U-turn. Some alternative designs include median U-turns (MUT), restricted crossing U-turns (RCUT), J-turns, and through U-turns (ThrU). Each intersection type...
Lundi, 10 Janvier, 2022 - 15:30
This report describes a study conducted to evaluate the performance and quantify the potential environmental benefits of recycled asphalt pavement projects completed in Virginia. The performance of the recycled projects was assessed by evaluating collected stiffness data and by the development of performance prediction models based on data obtained from the...
Lundi, 10 Janvier, 2022 - 15:30
Risk management is the central element of the safety management system (SMS). Identifying, assessing, analyzing, mitigating, communicating, and documenting are all steps in an effective risk management program. The TRB Transit Cooperative Research Program's TCRP Synthesis 157: Transit Safety Risk Assessment Methodologies is designed to help the transit...
