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Sub-problem 4c - Page 7 of 7 |
ID# C404C07 |
Sub-problem 4c: Peak Operational Analysis of
Alternate Route 7
Exhibits 4-74 and 4-75 show the results for time periods 3
and 4 respectively. We note in Exhibit 4-74 that the queue formed during
time period 2 clears during time period 3, by the first minute in segment 3
and by the third minute in segment 5. You can see that the demand that
wasn't served during time period 2 has been transferred to time period 3,
since the volumes in segments 4 through 11 that actually use the facility
exceed the original demand for these segments. For example, in segment 5,
the volume is 1,744, while the demand is 1,270. This means that a flow rate
of 1,744 minus 1,270, or 474, has been transferred from time period 2 to
time period 3. And since the demand for time period 3 is low enough, there
is sufficient capacity to serve both the original demand (1,270), plus the
transferred demand (474).
During time period 3, all segments operate at level of
service C or better, with the exception of segment 5, which is still
recovering from the queue, and operates at level of service E. The
speed in segment 5 is less than 20 mph during this recovery.
But by time period 4, all segments of the freeway facility
are operating at LOS B or better. All speeds exceed 40 mi/hr. And, once again, the demand equals the volume, indicating that all vehicles
desiring to travel along the facility during time period 4 are served.
|
Exhibit 4-74. Performance by Location for the
Third 15 Minutes of PM Peak Period |
|
Segment (Time period 3) |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
|
Speed (mph) |
55.0 |
42.5 |
51.8 |
-276.2 |
16.5 |
55.0 |
50.2 |
54.9 |
50.9 |
54.5 |
55.0 |
|
Density (veh/mi/ln) |
5.0 |
11.6 |
4.3 |
-1.3 |
13.5 |
15.9 |
16.4 |
10.4 |
13.9 |
10.0 |
9.2 |
|
Segment Capacity (vph) |
4,376 |
5,444 |
4,376 |
8,751 |
6,563 |
4,376 |
4,376 |
4,376 |
4,376 |
8,751 |
8,751 |
|
Level of Service |
A |
B |
A |
B |
E |
C |
B |
B |
B |
B |
A |
|
Segment Demand (vph) |
548 |
1,965 |
448 |
1,270 |
1,270 |
1,270 |
1,270 |
806 |
947 |
1,683 |
1,683 |
|
Segment Volume (vph) |
548 |
1,965 |
448 |
1,479 |
1,744 |
1,744 |
1,744 |
1,144 |
1,285 |
2,021 |
2,021 |
|
d/c ratio |
0.13 |
0.36 |
0.10 |
0.15 |
0.19 |
0.29 |
0.29 |
0.18 |
0.22 |
0.19 |
0.19 |
|
v/c ratio |
0.13 |
0.36 |
0.10 |
0.17 |
0.27 |
0.40 |
0.40 |
0.26 |
0.29 |
0.23 |
0.23 |
|
Minute Queue Begins in Segment |
|
|
|
** |
** |
|
|
|
|
|
|
|
Minute Queue Ends in Segment |
|
|
|
1 |
3 |
|
|
|
|
|
|
|
Exhibit 4-75. Performance by
Location for the Fourth 15 Minutes of PM Peak Period |
|
Segment (Time period 4) |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
|
Speed (mph) |
55.0 |
44.7 |
52.4 |
54.4 |
54.9 |
55.0 |
50.5 |
54.9 |
51.0 |
54.5 |
55.0 |
|
Density (veh/mi/ln) |
4.0 |
8.8 |
3.4 |
5.6 |
6.2 |
9.2 |
10.0 |
5.9 |
9.9 |
7.1 |
6.1 |
|
Segment Capacity (vph) |
4,376 |
5,448 |
4,376 |
8,751 |
6,563 |
4,376 |
4,376 |
4,376 |
4,376 |
8,751 |
8,751 |
|
Level of Service |
A |
A |
A |
A |
A |
A |
B |
A |
B |
A |
A |
|
Segment Demand (vph) |
438 |
1,571 |
357 |
1,015 |
1,015 |
1,015 |
1,015 |
644 |
756 |
1,345 |
1,345 |
|
Segment Volume (vph) |
438 |
1,571 |
357 |
1,015 |
1,015 |
1,015 |
1,015 |
644 |
756 |
1,345 |
1,345 |
|
d/c ratio |
0.10 |
0.29 |
0.08 |
0.12 |
0.15 |
0.23 |
0.23 |
0.15 |
0.17 |
0.15 |
0.15 |
|
v/c ratio |
0.10 |
0.29 |
0.08 |
0.12 |
0.15 |
0.23 |
0.23 |
0.15 |
0.17 |
0.15 |
0.15 |
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