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Modified
T- Intersections
This design treatment is intended for certain T-intersections in residential
areas where there is a need to reduce speeds of through traffic. It
involves a gradual curb extension or bulb at the top of the T such
that vehicles are deflected slightly as they pass straight through
the intersection (see diagram). This type of design can help to discourage
cut through traffic in a neighborhood and reduce speeds at the intersections.
If not properly designed, it can create confusion regarding priority
of movement. Consider a mini–circle before installing this treatment.
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The material provided on this page is from the FHWA publication
"Pedestrian Facilities User Guide." This guide is currently under review
by practicioners and others in the field. Subsequently, the material
provided on this page is subject to change in the future.
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Purpose:
• Reduce vehicle speeds through a T–intersection on a residential
street.
• Used when vehicle volumes are low to moderate.
Considerations:
• Don’t use this treatment if the main movement at the intersection
is intended to connect local streets.
• A mini–traffic circle may accomplish the same objective and
will be much less costly.
• If designed to eliminate some turning movements, the affected
neighborhood residents should be consulted for input and an analysis
of traffic patterns done to ensure that through traffic would not
be diverted inappropriately.
• Pedestrian access must be accommodated through the islands.
Estimated Cost:
$30,000- $60,000 depending on the design.
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