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Sub-problem 4b - Page 5 of 6 |
ID# C404B05 |
Sub-problem 4b: Off-Peak Operational Analysis
of Alternate Route 7
Step 2. Results
Let's first consider the level of service for the facility,
or, more correctly, for each segment of the facility that makes up
this analysis. We need to note that, using this method,
there is no overall performance measure for the facility as a whole. Part 3 of the HCM does cover issues relating to corridor and area-wide
analysis. But we will not cover them here. If you are interested
in learning more about this topic, consult part 4 of the HCM.
The level of service for each segment is shown in Exhibit
4-69. Each of the segments performs at level of service C or
better, with the exception of segment 2, the weaving segment. This
result is consistent with our analysis produced in Problem 2 where we
identified deficiencies with this weaving segment during
the peak period. We also noted that, while speeds in other segments
are nearly 50 mph or above, segment 2 has a forecasted speed below 28
mph, indicating a problem in the performance of the weaving segment.
We can also note that the demand/capacity ratio is near
one for this segment. What is the implication of a demand/capacity
ratio that is this high?
|
Exhibit 4-69. LOS by Roadway Segment |
|
SEGMENT TITLE
(EB Segment) |
S01 |
S02 |
S03 |
S04 |
S05 |
S06 |
S07 |
S08 |
S09 |
S10 |
S11 |
|
Type (B,W, ONR,OFR) |
B |
W |
B |
ONR |
B |
B |
OFR |
B |
ONR |
ONR |
B |
|
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 |
|
Free flow speed (mph) |
55 |
55 |
55 |
55 |
55 |
55 |
55 |
55 |
55 |
55 |
55 |
|
Speed (mph) |
55.0 |
27.9 |
48.1 |
53.4 |
54.8 |
55.0 |
49.9 |
54.9 |
50.8 |
54.5 |
55.0 |
|
Density (veh/mi/ln) |
10.0 |
35.3 |
7.6 |
10.8 |
14.4 |
21.6 |
21.8 |
13.7 |
17.8 |
15.0 |
14.8 |
|
Segment Capacity (vph) |
4,375 |
4,100 |
4,375 |
8,750 |
6,565 |
4,375 |
4,375 |
4,375 |
4,375 |
8,750 |
8,750 |
|
Segment Demand (vph) |
1,095 |
3,930 |
895 |
2,540 |
2,540 |
2,540 |
2,540 |
1,610 |
1,890 |
3,365 |
3,365 |
|
Segment Volume (vph) |
1,095 |
3,195 |
730 |
2,370 |
2,370 |
2,370 |
2,370 |
1,505 |
1,785 |
3,260 |
3,260 |
|
d/c ratio |
0.25 |
0.96 |
0.20 |
0.29 |
0.39 |
0.58 |
0.58 |
0.37 |
0.43 |
0.38 |
0.38 |
|
v/c ratio |
0.25 |
0.78 |
0.17 |
0.27 |
0.36 |
0.54 |
0.54 |
0.34 |
0.41 |
0.37 |
0.37 |
|
Vehicle LOS |
B |
E |
A |
B |
B |
C |
C |
B |
B |
B |
B |
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