Lundi, 6 Juin, 2022 - 15:15
The use of roundabouts in rural areas of the US is growing rapidly. For roundabouts constructed with concrete pavement, joint layout can be especially challenging. To reduce the need for sophisticated joint layouts, consideration is being given to constructing roundabouts without joints and instead using structural fiber reinforced concrete (FRC) to bridge any...
Lundi, 6 Juin, 2022 - 14:45
Although the use of recycled asphalt materials (RAM) in new asphalt mixtures can reduce the amount of virgin and nonrenewable materials required and increase the rutting resistance of pavements, it may also compromise cracking resistance. To mitigate this issue, asphalt mixtures containing RAM may require the use of a softer binder or recycling agent (RA)....
Lundi, 30 Mai, 2022 - 18:30
The Tipping Point – What COVID-19 Travel Reduction Tells Us About Effective Congestion Relief uses observed data collected before and during the COVID-19 pandemic in the Twin Cities metropolitan area to answer a question with important implications for highway investment planning and travel demand management: At what level of vehicle miles traveled (VMT)...
Lundi, 30 Mai, 2022 - 18:15
For several decades, stated preference (SP) studies have been the dominant method for transport valuation. However, there are many indications that revealed preference data is making a strong comeback due to access to Big Data and new analysis possibilities such as machine learning. In this report, we assess the capability of different RP data sources. We find...
Lundi, 30 Mai, 2022 - 18:15
This guide presents the basic principles that a pavement engineer needs to design and construct concrete overlays on existing asphalt, composite, and concrete pavements.
The intent of this guide is to increase the technical proficiency of experienced engineers in the use of concrete overlays, provide less experienced users with the essential knowledge...
Lundi, 30 Mai, 2022 - 18:15
The purpose of this literature review is to assess the current body of research for the incorporation of recycled material in pavements to inform updated guidance to the current Austroads Guide to Pavement Technology Part 4E: Recycled Materials. New applications for recycled materials are continually finding broader applications within industry and it is...
Lundi, 30 Mai, 2022 - 18:15
The TRB National Cooperative Highway Research Program's NCHRP Web-Only Document 325: Consideration of Roadside Features in the Highway Safety Manual describes the background, the research approach, the resulting run-off-road (ROR) crash predictive methods and presents a draft chapter for consideration by AASHTO for publication in the HSM. This document is...
Lundi, 30 Mai, 2022 - 18:15
While behavioral interventions are designed to seize attention, little consideration has been given to the costs of doing so. We estimate these costs in the context of a highway safety campaign that displays traffic fatality counts one week each month. We find that this intervention increases the number of crashes, with the effect dissipating over 7 km. The...
Mardi, 26 Avril, 2022 - 15:45
Approximately 1,282 fatalities on U.S. interstate highways in 2020 were due to nighttime road departures. A new ultra-bright retroreflective lane marking tape can save lives as well as offer both a very short payback period and a very substantial benefit/cost ratio over its useful lifetime.
The TRB IDEA (Innovations Deserving Exploratory Analysis) Program...
Mardi, 26 Avril, 2022 - 15:30
Superloads (SLs) are a class of vehicles that typically exceed both gross vehicle weight limits and axle load limits, in addition to occupying two or more lanes of traffic. In PA, SLs require special permits but their effect on pavement distresses have not been evaluated. In this study, lab and computational analyses were combined to quantify the effect of SLs...
Lundi, 11 Avril, 2022 - 15:00
This study investigates the performance benefits of synthetic structural fibers in mitigating distresses in thin concrete pavements and overlays. In this study, two ultra-thin (3 and 4 inches thick) and four thin (5 and 6 inches thick) concrete pavements placed on a gravel base along with two thin unbonded concrete overlay cells (5 inches thick) placed on an...
Mardi, 5 Avril, 2022 - 20:00
Micromobility is an innovative transportation strategy that has demonstrated a great potential for congestion mitigation. However, the research on micromobility is very limited in the field of transportation. This project aims to conduct a comprehensive study to analyze, quantify, and understand the impacts of micromobility on congestion reduction and recommend...
