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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

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Intersection Safety Case Study Summary

Continuous Green T-Intersections

A Colorado Success Story

FHWA-SA-09-016


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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.


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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


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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.


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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


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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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