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Sub-problem 4c: Peak Operational Analysis of Alternate Route 7

Let's note one other result for the sections downstream from the bottleneck (section 6). Note that the volume/capacity ratio is less than the demand/capacity ratio. Or, similarly, the demand is higher than the volume. What is the implication of this result? Some vehicles that desire to reach sections downstream from the bottleneck (sections 7 through 11) are unable to do so during time period 2. They are in the queue forming in sections 4 and 5 and will be delayed in this queue until at least time period 3. This unserved demand is transferred from time period 2 to time period 3.

Section (Time Period 2) 1 2 3 4 5 6 7 8 9 10 11
Length (ft) 3,675 670 1,025 775 1,890 10,900 1,500 3,100 1,115 1,500 2,000
Number of lanes 2 4 2 4 3 2 2 2 2 4 4
Type (B,W, ONR, OFR) B W B ONR B B OFR B ONR ONR B
Free flow speed (mph) 55 55 55 55 55 55 55 55 55 55 55
Speed (mph) 55.0 33.3 49.5 25.8 19.2 49.8 49.4 54.9 48.9 54.3 55.0
Density (veh/mi/ln) 19.5 25.7 21.2 44.9 75.8 44.0 39.4 28.4 31.3 26.1 26.2
Segment Capacity (vph) 4,375 5,020 4,375 8,750 6,565 4,375 4,375 4,375 4,375 8,750 8,750
Level of Service C C C F F F E D D C D
Segment Demand (vph) 2,150 3,425 2,100 4,850 4,850 4,850 4,850 3,460 3,880 6,090 6,090
Segment Volume (vph) 2,150 3,425 2,100 4,640 4,375 4,375 4,375 3,120 3,540 5,750 5,750
d/c ratio 0.49 0.68 0.48 0.55 0.74 1.11 1.11 0.79 0.89 0.70 0.70
v/c ratio 0.49 0.68 0.48 0.53 0.67 1.00 1.00 0.71 0.81 0.66 0.66
Minute Queue Begins in Segment     9 1            
Minute Queue Ends in Segment     ** **            
Queue Length at End of Time Period (ft)     745 1,890            

When you are ready to review the results from time periods 3 and 4, proceed to the next page.

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