TxDOT Research Library - TxDOT Research Project

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Use of Roundabouts and Innovative Intersection Designs at High-Speed Intersections in Texas

What Was the Need?

Rural high-speed roads continue to see increased volumes statewide. Traditionally, those roads might beconverted to limited-access highways under the speeds and volumes seen today, but that level of systematic conversion is not feasible. As a result, there are numerous at-grade access points on rural high-speed roads that introduce potentialoperational delays and safety concerns. Traditional at-grade intersections may not efficiently accommodate the demands increasingly found in many locations across Texas, particularly with increases in oversize/overweight (OSOW) vehicle volumes in some areas. Newer alternatives, such as modern roundabouts and innovative intersection designs, may be more suitable to improve safety and operations at many locations; however, guidance is needed to identify suitable alternatives and develop appropriate design details for specific intersections.

Project Summary

Researchers will investigate the operational and safety benefits of modern roundabouts and selected innovative intersection designs for high-speed locations, as well as best practices for designing these intersection alternatives. In this project, Researchers will compile proven results from these designs in other states and collect and analyze operational and safety data within Texas to develop design guidance that TxDOT can use to implement roundabout designs that accommodate OSOW vehicles and innovative intersections that provide appropriate access in rural areas.

Project Number

0-7036

Status

Completed

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Project Details

Start Date

8/6/2019

End Date

7/31/2022

Performing Institution(s)

Texas A & M Transportation Institute (TTI)

Research Team

RS: Marcus Brewer

Sponsor

Project Manager

Wade Odell

Contract Specialist

Tami Graham

TxDOT Advisor

Andrew Holick, BRY
Jed Irwin, PAR
Pauline Morrel, DAL
Cody Jolley, DAL
Heather Lott, TRF
Rebecca Wells, ATL
Minh Tran, FTW

Amount Funded

$499,969

Publications from this Project

Page:

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Functional Area

Safety and Operations

Index Terms

Highway design
Highway safety
Oversize loads
Overweight loads
Roundabouts
Rural areas
Trucks

Lead University

TTI

Researcher

Brewer, Marcus

TxDOT District

TRF
PAR
BRY
DAL
ATL
FTW

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Record Added:

7/24/2019

Record Updated:

10/11/2023 5:30 AM EDT

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