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Sub-problem 2a - Page 5 of 6

ID# C102A05

Sub-problem 2a: Analysis of the Existing TWSC Intersection Considering the Effects of the Adjacent Intersections

Exhibit 1-21. Analysis of the U.S.95/Styner-Lauder intersection with effects of adjacent intersections (Dataset9)
Sub-problem NB LT SB LT WB LT WB TH/RT EB LT EB TH/RT
Previous analysis
(sub-problem 1a)		 8.6 8.3 36.0 27.6 47.0 25.3
Current analysis
(sub-problem 2a)		 8.6 8.3 36.0 27.6 47.0 25.3

The answer lies in the distance between the TWSC intersection at Styner and the signalized intersection at Sweet Avenue. When a platoon leaves Sweet Avenue and travels 1,070 feet to Styner, it begins to disperse. Platoon dispersion means that the headways between vehicles begin to approximate a random distribution, which is what the TWSC intersection capacity model is based on. Thus, for this case, we see that the arrival patterns from the Sweet Avenue traffic have no effect on the capacity of the TWSC intersection at Styner/Lauder.

Discussion:
When would a signal make a difference in the arrival patterns at the downstream TWSC intersection? Continue to the next page for more discussion on this topic.

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