American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 23

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METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS
DE304.09 9-18 Revision 4: 05/09/12
Metro Baseline Re-Baseline: 04/29/10
Stand-Alone Validators (SAVs) in lieu of fare gates, with SAVs placed in the
Virtual Gate arrangement at or near entrances to platform boarding areas.
1. Queuing Analyses/Modeling:
Queuing analysis/modeling of station design, number of initially proposed fare
gates and Metro ridership forecasts shall be performed to determine appropriate
fare gate quantities for station entrances considered for fare gating.
Ridership forecasts used shall be based on 10-year out forecasts and
Maximum Line Capacity developed by Metro Operations.
Surge time, the length of time between the first and last person arriving at
the fare gates during a surge, shall be determined based on distance from
the mid-point of the station platforms to the planned fare gate areas. For
evaluation, both one and two minute surges times shall be evaluated when
this distance is less than 200 feet, and only the two minute surge time shall
used for distances greater than 200 feet.
Passengers per peak surge (1-2 minutes) shall be derived from ridership
forecasts.
The peak surge demand (the highest amount of arrivals at a fare gate within
a 1-2 minute time period) shall be dependent upon the number of trains that
arrive at each station during a peak hour.
The number of people per 10 seconds (demand) over the surge period shall
be determined and compared with worst case fare gate capacity and existing
fare gate capacity.
Worst Case fare gate capacity shall be 3 second service time per person
Existing fare gate capacity shall be 2 second service time per person
Maximum wait time (seconds), Maximum number of people in queue, and
Maximum queue length (feet) per gate shall be determined based on both
Worst Case and existing fare gate capacities.
Maximum wait time is the maximum time a person entering at the peak of a
queue length would have to wait.
Maximum number of people in queue is the expected maximum amount of
people that will be delayed at the fare gates.
Maximum queue length per gate is the queue space that would be needed
behind each fare gate to accommodate people waiting in the queue, based
on the maximum number of people in the queue.
Fare gates that serve only elevator passenger flow shall be considered
negligible due to varying elevator utilization factors, service times and
capacities.
The peak surge flow shall be applied to all turnstile and ADAAG leaf barrier
fare gates that are not elevator-only to represent a worst case situation. The
throughput of turnstile and ADAAG leaf barrier fare gates shall be
considered equivalent in the analysis.
A maximum queuing time of 55 seconds during surges shall be considered
an acceptable service standard.
Wait time results shall be evaluated as follows:
- Less than 5 seconds - No significant queues
- 5-30 seconds – Slight queues
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