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Modified T-Intersections:
This design treatment is intended for certain T-intersections on lower-volume
streets in residential areas where there is a need to reduce the 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 can
reduce speeds at the intersection. If not properly designed, it can
create confusion regarding priority of movement. Consider a mini-circle
before installing this treatment.
| Photo by Dan Burden
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| This modified T-intersection in Portland, Oregon, is intended to reduce speeds of through traffic as well as restrict left-turning vehicles. |
| • Reduce vehicle speeds through a T-intersection on a low-volume street. |
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• Used when vehicle volumes are low to moderate.
• A mini-traffic circle may accomplish the same objective and may be less
costly and confusing.
• 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 and bicycle access must be accommodated through the island. |
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| $20,000 to $60,000, depending on the design and whether drainage and utilities need to be relocated. |
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