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Sub-problem 1c - Page 1 of 5 |
ID# C501C01 |
Sub-problem 1c:
Analysis of the Signal with Pedestrians and Bicycles
Step 1: Setup
As we noted in the
TWSC portion of our analysis, pedestrians can have a significant effect on
delay. We can see how pedestrians (and bicycles assumed at 10% of
pedestrians) affect our signalized intersection by analyzing conditions both
with and
without taking account of the pedestrians and bikes; the results of this
analysis are presented in Exhibit 5-18.
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Exhibit 5-18.
Projected Museum at Reitz considering Pedestrians and Bicycles |
|
|
EB |
WB |
NB |
SB |
|
L |
T |
R |
L |
T |
R |
L |
T |
R |
L |
T |
R |
|
Queue w/Peds |
64.1 |
29.7 |
29.7 |
0 |
40.4 |
40.4 |
1.0 |
0 |
1.0 |
12.5 |
0 |
64.3 |
|
Queue w/o Peds |
62.4 |
29.7 |
29.7 |
0 |
38.2 |
38.2 |
1.0 |
0 |
1.0 |
11.7 |
0 |
35.2 |
|
Delay w/Peds |
584.6 |
17.8 |
17.8 |
0 |
24.6 |
24.6 |
27.3 |
0 |
27.3 |
35.5 |
0 |
311.4 |
|
Delay w/o Peds |
532.5 |
17.8 |
17.7 |
0 |
22.0 |
22.0 |
27.1 |
0 |
27.1 |
32.2 |
0 |
64.9 |
|
LOS w/Peds |
F |
B |
B |
- |
C |
C |
C |
- |
C |
D |
- |
F |
|
LOS w/o Peds |
F |
B |
B |
- |
C |
C |
C |
- |
C |
D |
- |
E |
|
Intersection w/Peds |
Delay |
162.3 |
LOS |
F |
|
Intersection w/o Peds |
Delay |
106.4 |
LOS |
F |
It is obvious from
this analysis that the
effects of pedestrians and bicycles on the intersection are significant,
almost doubling queues for the southbound right turns and increasing the
delay by about 35% (106 sec/veh to 162 sec/veh) across the overall
intersection.
This occurs due to
adjustments to the saturation flow rates to account for the effects of
pedestrians and bicycles on the conflicting vehicular movements; this is a
relatively new adjustment to the HCM operational analysis procedure, having
been introduced in Chapter 16, Appendix D of HCM2000. For this particular
analysis,
the resulting adjustments are important to take into account, especially for the southbound right turns where
the flow rate was reduced by 40%; but all movements had adjustment factors
lower than 1.00. With this level of effect on flow rate, and subsequently
capacity and delay, strategies to reduce this effect would be reasonable to
pursue.
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