Welcome to the Transportation Asset Risk and Resilience (TARR) Manual webpage. Here you will find information and updates on the progress of the National Cooperative Highway Research Program (NCHRP) Project 23-32, as well as relevant research in the field of transportation risk and resilience.

TARR Manual Objectives

The NCHRP Project 23-32 is developing a science-based technical manual to assess risk and resilience in transportation planning, design, construction, operation, maintenance, and emergency response and recovery decisions. The key objectives of the TARR Manual are:

Risk Assessment Methodology

Quantitative, repeatable methods for conducting risk assessments on top priority threats/hazards for transportation assets

Historical Data Support

A historical data-capture process and system to support risk and resilience modeling and assessments

Resilience Assessment

Quantitative resilience assessment methods and metrics for transportation assets

Identify Top Strategies

Standardized methods to help transportation agencies identify the most appropriate risk mitigation or resilience improvement strategies

Z

Promote AASHTO Adoption

The goal is for the manual to be adopted by AASHTO

Who Benefits?

  • State Departments of Transportation
  • Transportation Practitioners
  • Infrastructure Planners and Designers
  • Asset Management Teams
  • Operational Planning Specialists

Manual Significance

  • First-of-its-kind manual for assessing quantitative risk of natural threats to transportation assets
  • Adaptable to different agency sizes and geographic reach
  • Scalable for various project types and sizes
  • Customizable risk assessment methodologies tailored to users’ available data and resources

Timeline

Phase

01

Planning

Nov. 2023 — Jun. 2024

Task 1

Project Initiation

Task 2

State-of-the-Practice
Review & Industry Outreach

Task 3

Phase I Interim Report & Meeting

Phase

02

Execution

Jun. 2024 — May 2026

Task 4

Inputs & Requirements

Task 5

Model Construction

Task 6

Model Assessment

Task 7

Demonstration & Application

Task 8

Develop Draft Manual

Phase

03

Final
Deliverables

May 2026 — Nov. 2026

Task 9

Final Manual

Executive Primer

Stand-Alone Research Report

Recommendation for Future Research

Stand-Alone Implementation Plan

NCHRP 23-32 Project Outcomes

  1. TARR Manual: A comprehensive step-by-step quantitative guide to assess annual risk from various threat-asset pairs, including data sources and example problems.
  2. Final Research Report: Documenting key findings and methodologies.
  3. Future Research Recommendations: Including problem statements for continued advancement.
  4. Implementation Plan: Outlining pathways, key implementers, and capacity-building steps.
  5. Executive Primer: A short summary for agencies, detailing intended users, manual usage, and case studies of state DOTs using similar models.