Case Study Tag: Roadway departure

MASH Test Level 3 Compliant Guardrail System on 1H to 1V Slope

Texas

Under some conditions, achieving the recommended 2-ft offset from guardrail posts to the slope break is challenging. Texas A&M Transportation Institute found a thrie-beam option would work in these conditions and pass MASH TL-3 tests.

Roadside Pooled Fund Test Report 2024 Safety Summit Poster

Crash Testing of Electric Vehicles into W-Beam Guardrail and Roadside Barriers

Nebraska

Crash testing of electric vehicles (EVs) into W-beam guardrails revealed concerns about the compatibility of EVs with existing barriers due to increased weight from batteries. In the first test, a Tesla Model 3 penetrated under the guardrail, and in the second test, a Rivian R1T ruptured the guardrail and penetrated through the barrier.

University of Nebraska-Lincoln Article Local News Article University of Nebraska-Lincoln Video 2024 Safety Summit Poster: W-Beam Guardrail 2024 Safety Summit Poster: Roadside Barriers

Route 101 Safety Improvements

New Hampshire

NHDOT used a data-driven process to identify and implement Safe System countermeasures to improve safety on Route 101. The selected alternative—6-foot median buffer with rumble strips and wider pavement markings—addresses both head-on and run-off-road crashes at a much lower cost than median barriers, which extends the project limits from 1.2 miles to 4.7 miles.

ACEC-NH Award Project Website Local News Article 2024 Safety Summit Poster

Data for Proactive Road Safety: Continuous Pavement Friction Measurement

Kentucky

Pavement Friction Management (PFM) using Continuous Pavement Friction Measurement (CPFM) is a proactive approach for managing pavements for safety throughout the roadway lifecycle. Taking a lifecycle approach to designing, specifying, and maintaining friction performance saved Kentucky more than $1 billion annually and reduced fatal and severe crashes by up to 24%.

FHWA Case Study Presentation Slides USDOT Flyer 2024 Safety Summit Poster

Pavement Marking Retroreflectivity

FHWA

The Final Rule on maintaining pavement marking retroreflectivity goes into effect September 6, 2026. Agencies can use recommended methodologies to better prioritize budgets, maximize the life of pavement markings, and improve roadway safety.

Methods Report MUTCD 11th Edition Methodology Videos 2024 Safety Summit Poster

American Samoa Road Safety

American Samoa

The rugged terrain and high-sloped roadsides of Pacific islands is prone to rockfall, landslides, and tidal waves. American Samoa employs a variety of strategies and traffic devices to improve safety.

Highway Safety Plan 2024-26 2024 AASHTO Safety Summit Poster

Statewide Deployment of Center Line Rumble Strips

Oklahoma

Centerline rumble strips reduced fatal and serious injury collisions by 18%.

Local News Article FHWA Guidance AASHTO Case Study

Grooves of Guardianship: Unveiling the Impact of Rumble Strips

Georgia

Rumble strips reduced injury and fatal crashes by 48% on analyzed roadways.

Georgia 2023 HSIP Report Local News Article AASHTO Case Study