Case Study Tag: Design

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Rounding Out Roundabouts in CT

Connecticut
Connecticut DOT formed a roundabout committee of professionals trained on evaluating the planning, design, and construction of roundabouts on municipal and state roads.
AASHTO Safety Summit Poster 2025CDTOD Roundabouts WebsiteLocal News VideoLocal News Article

FDOT’s Application of Target Speed

Florida
FDOT developed a context classification guide for roadway design. Target speeds are determined by many data points, by context classification and for the safe mobility of all users.
AASHTO Safety Summit Poster 2025Context Classification GuideSmart Growth America Article

FDOT’s Statewide Systemic Analysis

Florida
FDOT uses a data-driven, risk-based approach to guide systemic investments. Their systemic analysis led FDOT leadership to approve $35 million in HSIP funds, plus additional state funding for safety investments.
AASHTO Safety Summit Poster 2025

NCHRP: Institutionalizing the Safe System Approach in Planning and Programming

NCHRP
The new toolkit from NCHRP Project 08-171 helps transportation agencies break down barriers to SSA adoption. It offers 30 practical strategies in areas like working with elected officials, funding, and multimodal network design.
AASHTO Safety Summit 2025 PosterTRB Project Page

Safety Circuit Rider Program

Virginia
The Safety Circuit Rider program provides training and technical assistance to improve safety on local roadways.
University of Virginia Webpage2023 Safety Summit Poster

Systemic Countermeasures Implementation and Tracking

Virginia
Virginia DOT created a statewide inventory and tracking system for the performance of countermeasures, leading to better communication among employees and partners, and the ability to track ongoing progress.
2023 Safety Summit Poster

Safer By Design Safety Scoring Tools

Texas
TxDOT's Safety Scoring Tools help designers understand the safety impacts of design elements and optimize safety in projects.
TXDOT Safer By Design Webpage2023 Safety Summit Poster

A Collaborative Investigation of Truck Access into Roundabouts in Oregon

Oregon
Oregon DOT used field and simulation methods to understand and mitigate delays experienced by motor carriers in roundabouts, highlighting potential for improvements to better accommodate large vehicles.
Oregon State University Final Research Report2023 Safety Summit Poster

Development and Application of Safety Performance Functions in Project Delivery

Iowa
Based on models of Safety Performance Functions (SPFs), Iowa screened roadway facilities for Potential for Crash Reduction (PCR). PCR was then applied to project screening and prioritization, intersection projects, Super-2 corridor studies, a pilot safety corridor program, and environmental assessments.
Iowa State University ArticleIowa DOT PCR Portal2023 Safety Summit Poster

Systemic and Proactive Rural Curve Evaluation

Georgia
GDOT incorporated visibility enhancements and friction improvements on rural curves after finding that lane departures represented a large proportion of fatalities on curves.
FHWA Low-Cost Local Safety Solutions, 6.1FHWA Case Study, page 532023 Safety Summit Poster
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