Naylor Road Metro Station Area Access and Capacity - WMATA.com.

Appendix 4: Bus Bay Requirements
Determining the number of bus bays required to accommodate future service began with a
calculation of existing utilization rates for each bus bay. Table A-4 shows the calculation of bus
bay requirements by route, and Table A-5 shows the rate of utilization by bus bay. Existing peak
hour headways and recovery times were derived from data provided by Metro and TheBus. All
routes include a minimum dwell time of one minute, and any scheduled dwell time over one
minute was entered as recovery time.
To estimate at the number of buses that will serve Naylor Road Station during the peak hour in
2040—and thus the required number of bus bays—the analysis used the passenger load metric
(see Table A-6), which is equal to the occupancy of the bus at the station. Because the passenger
load includes riders passing through a point as well as those exiting or entering at a point, it
provides a more complete picture of demand for bus service.
The analysis assumed
that the passenger
loads for all routes
that serve at Naylor
Road Station are
approximately 35
passengers per
bus. These per-bus
passenger loads
were multiplied by
the number of buses
that serve the station
during the peak
hour (Table A-4), and
then multiplied by
the percent increase
in peak-period bus
passengers estimated
from the travel demand model. The
result, shown in Table A-6, is a routeby-route
estimate of average peak hour
passenger loads at Naylor Road Station
by 2040.
Table A-7 summarizes the estimate of
required Naylor Road Station bus bays
per route by 2040. The number of buses
per peak hour by 2040 is calculated
by dividing the 2040 average peak
hour passenger load by the assumed
capacity of a typical bus, in this case
Table A-4: Existing Bus Bays Required
(A) Peak
Hour
Headway
(minutes)
(B) Buses per
Peak Hour
(C) Average
Recovery
Time
(minutes)
(D) Average
Total Time at
Bay per Bus
(minutes)
(E) Tolerance
Time
(minutes)
(F) Bays
Required
Route
Metrobus
M2 20 3.0 3 4 4 0.4
F14 30 2.0 5 6 4 0.3
H11/12/13 15 4.0 6 7 4 0.7
C12/C14 25 2.4 4 5 4 0.4
36 15 4.0 9 10 4 0.9
39 15 4.0 0 1 4 0.3
34 15 4.0 5 6 4 0.7
TheBus
32 30 2.0 8 9 4 0.4
Total 25.0 6.0
D. Average Total Time at Bay per Bus = One-minute dwell time + C
E. Tolerance Time = Accounts for the variation of arrival times (two minutes for through buses and
four minutes for terminating buses)
F. Bays Required = ((D + E) * B) / 60
Table A-5: Existing Bus Bay Utilization
Bus
Bay
(G) Buses
per Peak
Hour
(H) Total
Time at Bay
(minutes)
(I) Bay
Utilization
Route
Provider
M2 Metrobus A 3 24 40%
F14 Metrobus B 2 20 33%
Drop off only - C - - -
H11/12/13 Metrobus D 4 44 73%
C12/C14 Metrobus E 2.4 22 36%
36, 39 Metrobus F 8 76 127%
34 Metrobus G 4 40 67%
32 TheBus H 2 26 43%
G. Buses per Peak Hour = ∑ B per bay
H. Total Time at Bay = ∑ (B * (D + E)) per bay
I. Bay Utilization = H / 60
81 | Appendices