Road structure – process – or apparatus – Road system
Patent
1997-10-29
1998-08-18
Graysay, Tamara L.
Road structure, process, or apparatus
Road system
E01C 100
Patent
active
057950954
ABSTRACT:
A right hand traffic intersection at grade of four roadways and method of directing vehicles to cross an intersection center bidirectionally along two opposed roadways in Phase 1, along the other two roadways in Phase 2, and to make simultaneous protected left- or U-turns from all four roadways, with through-traffic stopped, in Phase 3 of a 3-phase signal cycle. Two left turn passages in each roadway located between incoming and outgoing main lanes terminate at the intersection center at two locations, cross at an interchange zone some distance from the center and connect to the main lanes yet farther from the center. Vehicles making a left turn enter the center from the left passage whereas traffic arriving from a left turn enter the right passage. This keeps all left turn tracks in the center apart. Traffic signals control traffic at the intersection center and interchange zones. The design and methodology for a three-roadway, "T"-shaped, intersection is similar. The stem of the "T" has two left turn passages and an interchange zone, the right top has a single left turn lane and the left top has none. Signals follow a 2-phase cycle, during Phase 1 vehicles may cross the intersection center bidirectionally in the top of the "T", and in Phase 2 vehicles may make simultaneous protected left- or U-turns from the stem and from the right top with through-traffic stopped.
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Graysay Tamara L.
Hartmann Gary S.
LandOfFree
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