Document Library

This guide from TRB’s National Cooperative Highway Research Program offers strategies for state DOTs and partner agencies to build and sustain a strong risk management culture. It emphasizes preparing for evolving challenges—from infrastructure failures to supply chain disruptions—using the Key Bridge collapse in Baltimore as a recent example.

This study evaluated winter salt application efficiency on Open Graded Friction Course (OGFC) and Dense Graded (DG) pavements along I-95 in Needham, Massachusetts, to provide evidence-based winter maintenance guidance for MassDOT. The methodology incorporated field site instrumentation, maintenance tracking, direct friction measurements, crash data analysis, and an internet-based survey. However, a full data analysis was hindered by gaps in crash records and photographs, alongside unseasonably mild winters during 2023–2024 and 2024–2025. Furthermore, the survey revealed that only 12.5% of respondents currently utilize OGFC in their states, citing concerns regarding snow and ice, durability, cost, and performance failures.

Based on the limited data collected, both OGFC and DG pavement surfaces responded similarly to winter maintenance treatments regarding pavement temperature and friction. Due to the incomplete crash data and limited direct friction measurements, safety implications could not be fully investigated, and no changes to winter maintenance application rates could be recommended. Overall, the study indicates that OGFC and DG pavement types perform comparably when subjected to the same winter maintenance practices.

NCHRP Research Report 1158: Developing Snapshots for Transportation Planning, chronicles the process of developing four Snapshots of Planning Practices. Snapshots are concise and visually appealing documents that report on current planning practices in use by transportation agencies across four practice areas: Complete Streets, Data Sharing for Performance Management, Collaboration on Local Freight Delivery, and Economic Analysis to Support Decision-Making.

NCHRP Web-Only Document 431: Snapshots of Planning Practices, provides a series of illustrated "snapshots" as as a resource for transportation-planning practice development. This supplemental web-only document provides information for realistic practice implementation and program advancement and was published accompanying NCHRP Research Report 1158: Developing Snapshots for Transportation Planning.

NCHRP Research Report 1135: A Guide to Applying the Safe System Approach to Transportation Planning, Design, and Operations, provides information for state departments of transportation and other transportation agencies to apply the holistic Safe System approach.

NCHRP Web-Only Document 413: Applying the Safe System Approach to Transportation Planning, Design, and Operations is supplemental to NCHRP Report 1135: A Guide to Applying the Safe System Approach to Transportation Planning, Design, and Operations.

NCHRP Synthesis 652: Traffic Capacity Level of Service: Adaptations and Usage provides resources for state DOTs to evaluate and improve the LOS practices and policies

This report explores the use of AI and computer vision to automate condition assessment of roadside safety assets for UDOT. Leveraging street-level imagery, the project tested object detection models (YOLO11n) and vision-language models (Gemma 3, Llama 3.2) to classify defects, rate conditions, and evaluate design compliance for primary and secondary assets. Findings highlight the challenges of defect detection, the promise of advanced models, and opportunities to improve maintenance prioritization and roadway safety.

Developed as a modular, open-source Python package with accompanying Jupyter notebook examples and hosted on GitHub, this tool provides a scalable approach to pavement condition monitoring. The research shows that temperature data collected from embedded thermocouples, when analyzed using advanced computational techniques, can serve as reliable indicators of pavement degradation, supporting more informed, data-driven infrastructure management decisions

This calendar includes meetings hosted by the AASHTO Committee on Performance Based Management and its subcommittees, as well as programs and events supported by the Transportation Performance Management Technical Service Program, including peer exchanges and monthly webinars. This calendar spans June 2025 - December 2025.