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Sub-problem 3a - Page 4 of 9

ID# C103A04

Sub-problem 3a:  Oversaturated Intersection Analysis

Data were collected for a typical post-football game period at the U.S. 95/Styner Avenue-Lauder Avenue intersection. Exhibit 1-27 shows the demand (flow rates in veh/hr) for the four 15-minute periods immediately following the football game:

Exhibit 1-27. U.S.95/Styner-Lauder Avenue Intersection Demand Volumes

15-min time period beginning Eastbound Westbound Northbound Southbound
LT TH RT LT TH RT LT TH RT LT TH RT
4:00 pm 40 55 175 50 50 75 100 815 45 40 700 55
4:15 pm 50 75 375 55 80 125 215 1,025 50 59 1,975 165
4:30 pm 30 75 125 45 75 115 20 975 35 55 1,200 145
4:45 pm 45 60 175 55 85 150 145 1,015 45 50 1,350 130

How will the intersection perform, under both signal control and stop sign control, for these demand conditions?  How should we proceed with this analysis?

We will first consider the operational performance of the intersection operating under today's control conditions (two-way stop-control) to confirm what we suspect: the high volumes on the main street (U.S. 95) will cause long delays on the side streets (Styner and Lauder Avenues). If this is found to be the case, it may further support a recommendation that signalization is a valid option to handle current and future traffic volumes. Even so, it is important to note that event-related conditions would not, by themselves, be sufficient justification for installing a traffic signal at this intersection.

We will then consider the operation of the intersection under signal control. Here, we will break down the analysis into four steps, one for each of the four time periods, in sequence, starting with the 4:00 p.m. to 4:15 p.m. time period. 

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