Transportation Research Circular E-C302: 2nd Conference on Advancing Transportation Equity , from the Transportation Research Board, summarizes the presentations and discussions from this event held July 15–18, 2024, in Baltimore, Maryland.

Simulation has become a crucial tool for evaluating the effectiveness of proposed capital investments aimed at improving transportation system performance. Factors such as persistent congestion, complex facility operations, and the rapid advancement of technologies and transportation systems management strategies have required agencies to invest in developing and utilizing simulation models. TR Circular E-C298: Transportation Systems Simulation Compendium , from the Transportation Research Board, provide...

Asphalt mix design has always been considered a balance of rutting resistance and durability. The conventional Superpave mix design system targets 4% air voids during design and is referred to in this circular as Superpave4. The Superpave5 concept is a modification to the conventional Superpave4 approach. Transportation Research Circular E-C300: Superpave5: How Increasing Air Voids Can Improve Asphalt Pavement Durability , from the Transportation Research Board, captures information exchanged during the ...

Asphalt mix design has always been considered a balance of rutting resistance and durability. The conventional Superpave mix design system targets 4% air voids during design and is referred to in this circular as Superpave4. The Superpave5 concept is a modification to the conventional Superpave4 approach. Transportation Research Circular E-C300: Superpave5: How Increasing Air Voids Can Improve Asphalt Pavement Durability , from the Transportation Research Board, captures information exchanged during the ...

The most inherent advantage of a smooth pavement surface is its reduced noise levels compared to a pavement that is not smooth, but beyond the noise impacts there lies indirect and direct benefits that people gain from a smooth pavement. Transportation Research Circular E-C297: Concrete Pavement Smoothness: 2023 Workshop , from the Transportation Research Board, was developed from presentations made during the 102nd TRB Annual Meeting in a workshop titled "Concrete Pavement Smoothness."

Federal laws and rules require performance standards to be implemented to enhance stewardship of the transportation infrastructure and foster greater innovation in delivering a resilient transportation system, including the life of pavement systems, that supports prosperity and opportunity. Transportation Research Circular E-C296: Foundation Design and Construction for 100-Year Pavement Systems documents the presentations and discussions from two workshops held during the 2024 and 2023 TRB Annual Meeting...

Asphalt mixture mechanical tests (such as Hamburg Wheel-Track, Asphalt Pavement Analyzer, Indirect Tensile Cracking) are growing in use by numerous state departments of transportation (DOTs) as part of their standard material specifications to complement volumetric properties and help ensure satisfactory asphalt mixture performance. Transportation Research Circular E-C294: Adjustment to Asphalt Mixtures to Meet Performance Testing Requirements and Allow Innovations , from the Transportation Research Boar...

Asphalt pavement stakeholders are working toward a common goal of net-zero emissions by 2050 and incorporating the use of technologies and tools to rationally quantify the environmental impacts of asphalt pavement materials and construction alternatives. Transportation Research Circular E-C295: Day-to-Day Practices to Reduce the Carbon Footprint of Asphalt , from the Transportation Research Board, summarizes a session called "Day-to-Day Practices to Reduce the Carbon Footprint of Asphalt," which was hel...

The design of asphalt mixtures for use in infrastructure applications has generated significant research and focus over recent years. Recent advancements in mechanical testing of asphalt mixtures, often referred to as "performance tests," brought to the asphalt community the concept of Balanced Mix Design (BMD) and the use of these tests to augment or go beyond volumetric design. TR Circular E-C293: Listen Up! Challenges for Asphalt Balanced Mixture Design Implementation and How the Research Community Ca...

Monitoring travel on the nation's roadways is crucial for understanding the dynamics of the U.S. transportation system. This involves both broad assessments, such as calculating annual average daily traffic to report on vehicle miles traveled, and detailed analyses, like examining freeway operations on a minute-by-minute basis. TR Circular E-C292: Advancing Highway Traffic Monitoring Through Strategic Research: 2024 Update , from the Transportation Research Board, is a collaborative effort of over 60 spe...