Station Planning
The Objectives in Station Planning
In planning any station
the following objectives need to be kept very much in mind:
•Attractiveness in appearance.
•Free movement of
passengers.
•Safe evacuation in
emergency.
•Access for the
disabled.
•Access for emergency
services.
•Safe accumulation and
dispersal of crowds.
•Reliable operation of
train service.
•Resilience to failure.
•Cost-effective investment.
Planning for Normal Operation
The degree to which the
business is prepared to invest in providing space purely for the added comfort
of passengers must be decided by each railway system based on its own market
position and objectives.
The starting point for
any station planning is the demand forecast. This must be accompanied by a
detailed knowledge of the likely train frequency from each platform and the
time staff would need to take action when problems arise. Given working
assumptions, it is then possible to determine
how many people are likely to have
accumulated within a particular area before control measures can be instituted.
The operator must
determine his own relative values for key variables which combine to determine
the minimum size and capacity for any element of a station.
These will include:
•time needed to become
aware of a problem.
•staff reaction and
decision time.
•action implementation
time.
•accumulation rate for
passengers.
•maximum density for
safety.
The frequency and
destination pattern of the train service is also a key factor in the sizing of
station infrastructure. Assuming, for instance, that the total staff reaction
time is effectively five minutes and that the normal peak service is at five
minute intervals, capacity at the platform must allow for at least twice the
normal numbers expected in the peak.
Capacity Requirements
It is recommended that
the following limits should be applied to station areas for demand levels under
normal peak conditions:
Platforms, ticket halls
and concourses - 0.8 sqm per person Passageways
•one way - 50
persons per minute/m width
•two
way- 40 persons per minute/m width Fixed Stairways
•one way - 35
persons per minute/m width
•two way- 28
persons per minute/m width
To allow for ?peaks
withinlated peak peak'fifteen-minute itflow is wi figure, which can be derived
from the one-hour figure by multiplying by 0.3.
Similarly the peak five-minute flow figure can be
derived by multiplying the fifteen-minute figure by 0.4. This five-minute
figure should be used when testing the layout ensure that dangerous situations
do not occur during the short lived period when crowding exceeds desirable
levels at a restricted localised point.
The capacity of
entrances and exits to street level should follow the guidelines above. From
subsurface ticket halls/concourse areas there should be at least two exits to
the street each of which must be able to take the full peak level demand albeit
under crowded conditions.
Locations which are fed
by exits from stations need to be examined to ensure that no bottle-necks exist
immediately outside station buildings.
This is particularly
important where stations exit into Local Authority subways, shopping malls or
where sporting events are likely to produce ?tidal wave'ing. crowd
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