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Intersection Safety Case Study Summary. Continuous Green T-Intersections. A Colorado Success Story. FHWA-SA-09-016. The Challenge. Angle crashes are among the most severe crashes that occur at intersections, including T-intersections. Limited stopping sight distance is a common reason.

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Intersection Safety Case Study Summary

Continuous Green T-Intersections

A Colorado Success Story

FHWA-SA-09-016

the challenge
The Challenge

Angle crashes are among the most severe crashes that occur at intersections, including T-intersections.

Limited stopping sight distance is a common reason.

Colorado Department of Transportation (CDOT) sought an intersection design treatment to reduce the number and severity of crashes at signalized T-intersections.

solution
Solution

Continuous Green T-intersections (CGT):

Main line through traffic passes through without stopping (the top side of the “T”), denoted with continuous green signal

Dedicated acceleration and deceleration lanes provided for left-turning movements

Concrete median and pavement markings provide lane separation

technical data
Technical Data

Locations:

2 high-crash intersections in Colorado

Speed Limits:

Ranged from 35 mph to 50 mph

Implementation Cost:

$300,000 per intersection including the new signals and the raised median work

Implementation Time:

3 months per intersection

Implementation Issues:

CDOT experienced no implementation issues with this countermeasure.

results at treated intersections
Results at Treated Intersections

Average Crash Reductions:

96.8% reduction in angle crashes per year

70% reduction in injury crashes per year

60% reduction in total crashes per year

for more information
For More Information

Visit FHWA’s intersection safety web site to download this and other case studies highlighting proven intersection safety treatments from across the country: http://safety.fhwa.dot.gov/intersection

Or Contact:

Ed Rice

Intersection Safety Team Leader,

FHWA Office of Safety

Phone: (202) 366-9064

E-mail: [email protected]

Zane Znamenacek

Region 3 Traffic Operations Engineer,Colorado Department of Transportation

Phone: (970) 683-6278

E-mail: [email protected]

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