| Five-point intersection application of Two-Level Signalized Intersection |
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| (1) |
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| Incoming traffic from A and D pass through the upper level, while traffic from B, C and E pass through the lower level.
In other words, the top level would utilize a two-phase signal system, while the lower level would utilize a three-phase signal system.
Only the right turns made from traffic incoming from D are routed to the lower level.
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| (2) |
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| Incoming traffic from A and E pass through the upper level, while traffic from B, C and D pass through the lower level.
Again, the upper level would utilize a two-phase signal system, while the lower level would utilize a three-phase signal system.
Only the right turns made from traffic incoming from E are routed to the lower level. |
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| (3) |
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| Incoming traffic from B and D pass through the upper level, while traffic from A, C and E pass through the lower level.
Again, the upper level would utilize a two-phase signal system, while the lower level would utilize a three-phase signal system.
Incoming traffic from B and D that make right turns are processed on the upper level. |
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| Of course, in applying the two-level signalized intersection (TLSI), the upper level could be in a three-phase signal system, and the lower level could be in a two-phase signal system.
Decision to utilize two-phase signal system for which road depends on the amount of traffic in each direction and road condition.
It is possible to take the signalized interchange to six-point intersection or more. For a six-point interchange, each of the upper and lower levels would have a three-phase signal system. |
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* There is a list of variations in application of the Two-Level Signalized Intersection to the four-point intersection. Please refer to the variations on the two-level signalized intersection on the four-point intersection.
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