American Audio VELOCITY - REV 4-05 Operations Instructions download pdf (Page 21)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

DE304.09 9-16 Revision 4: 05/09/12

Metro Baseline Re-Baseline: 04/29/10

Communications cabling shall be kept separate of power wiring; and shall be

run continuously, without splices, from source to System Components

location.

9.2.6 Sizing Methodology

All calculations must be done based on Maximum Line Capacity requirements

and based on projected ridership minimum Metro policy requirement. For fare

gates, final quantities shall be established based on Maximum Line Capacity

Requirement, modified as necessary by results of queuing modeling analysis

and as necessary to comply with NFPA 130 station egress requirements.

A. Parameters and Overall Methodology – TVMs and SAVs

This section describes the method used for calculating total quantities of TVMs

and, at stations without fare gates, SAVs required at a station beyond the

minimum quantity requirements stated above. General principles for allocating

the calculated totals to separate arrays are also indicated.

Calculations of TVM and SAV quantities are made for each station's AM and PM

peak patronage, including surges due to arriving buses and trains at connecting

stations. Whichever period requires the greater number of pieces of equipment

governs. Passenger volumes may be revised by future studies or data.

Fare collection equipment is grouped by array. Each fare array is a grouping of

TVMs and SAVs within a free area. Allocation of the total number of pieces of

equipment to each array in a station is based on station configuration, and site-

access-related factors.

B. Calculation Methodology

Enough ticket vending machines shall be provided at a station so that no

passenger will be required to wait more than two minutes for a TVM or twenty

seconds for a SAV.

Equipment quantity needs shall be developed using a queuing model that

analyzes machine usage patterns to determine the effect of different equipment

quantities on passenger throughput and wait times. The model output shall be

the maximum process time – queuing plus actual transaction time – for various

alternative numbers of machines available at each station. Required

functionality of the model is summarized below.

The model requires input data to calculate a number of intermediate variables.

These are used to determine final maximum wait time statistics.

Input Data include:

 System-wide inputs apply to all stations:

 Ridership growth adjustment

 Month of year adjustment

 Day of week adjustment

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American Audio VELOCITY - REV 4-05 Operations Instructions Page 21