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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.

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.

Modified T-Intersections


Intersection Median Barriers


• Reduce vehicle speeds through a T–intersection on a residential street.

• Used when vehicle volumes are low to moderate.


• 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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