A quadrant roadway intersection includes an extra roadway between two legs of the intersection. This roadway adds two three-way intersections in addition to the original four-way intersection.
The advantage is that all left-turns (for countries that drive on the right-hand side of the road) are removed from the primary intersection. Therefore, the three-way intersections may operate with three signal phases and the four-way intersection may operate with only two signal phases. The reduced quantity of signal phases improves the efficiency of the intersection.
The disadvantage, however, is that motorists wishing to turn left from either the major or minor road may have to travel further to do so. Also, right-of-way and cost limitations may reduce the feasibility of this type of intersection treatment.
Grade separations
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The examples and perspective in this article deal primarily with Canada and do not represent a worldwide view of the subject. Please improve this article and discuss the issue on the talk page. |
In some areas, the two main roads are grade-separated (with one traveling over the other), and the quadrant road serves to link the two main roads together. This is most frequently found in Thornhill, in the Greater Toronto Area in Ontario, Canada, because there are many instances where large, heavily traveled, fast roads intersect a smaller road of equal importance but with less and slower traffic. Since blockage of the faster road would not be efficient, the Quadrant Roadway is used. Though the implementation is most commonly seen in the Thornhill area, it can be widely used elsewhere with similar traffic patterns too; implementation of such systems in other roads were either seen as impracticable due to cost, space constraints, or improper traffic flows where such a system would be not work efficiently.
- [1] Dundas Street and Cawthra Road, Mississauga, Ontario
- [2] Highway 7, Langstaff Road, and Dufferin Street, Vaughan, Ontario
- [3] Highway 7 and Bathurst Street, also in Vaughan, Ontario
- [4] Highway 7 and Yonge Street, Markham, Ontario
- [5] Highway 7 and Bayview Street, Markham, Ontario
- [6] Bloor Street and Stevenson Road, Oshawa, Ontario
- [7] Exchange St. and Wolf Ledges Pkwy., Akron, Ohio (The quadrant roadway has its own name, Arc Dr., but has no driveways or addresses and serves solely as the quadrant roadway.)
- [8] Maryland Route 140 and Owings Mills Blvd. in Owings Mills, Maryland
- [9] New York Route 130 Broadway St. and New York Route 277 Union Rd. in Depew, New York
- [10] Meridian St. and 146 St. via Greyhound Pass in Carmel, Indiana
External links
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