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Accessible Path-- a barrier-free path that persons with mobility or sensory
impairments can safely follow without obstacles or obstructions. Accessible paths are at
least 5 feet wide and level.
Aisle-- the portion of the parking lot devoted to providing immediate access to
the parking stalls. The recommended aisle width is dependent on the parking angle. A
parking angle of 45 o requires an aisle width of 12 feet for a 9.0-foot stall,
and a 90o parking angle requires an aisle width of 26 feet for a 9.0-foot
stall. These dimensions lead to wall to wall distances of 47 feet for 45o and
63 feet for 90o.
CBD-- Central Business District, typically ranging from an average size of 27
blocks (10,000-25,000 population cities) to over 200 blocks (cities over 1,000,000
population).
CBD Core-- the heart of business, commercial, financial and administrative
activity. Typically ranges in size from an average of 7 blocks (10,000-25,000 population
cities) to over 60 blocks (cities over 1,000,000 population).
CBD Fringe-- the area immediately surrounding the CBD, usually within 2-3
blocks.
Change of Mode-- the transfer from one form of transportation to another. A park
and ride lot is an example of a change of mode, where an auto driver parks the vehicle and
rides public transportation for the remainder of the trip.
Cordon Count-- the simultaneous counting of all traffic entering and leaving a
given area such as a CBD. It is generally a manual vehicle classification count,
supplemented with automatic traffic recorder counts.
Duration-- the length of time a vehicle remains in one parking space.
Long Term Parking-- parking with a duration of three hours or more.
Module-- a complete module is one access aisle, servicing a row of parking on
each side of the aisle. Both the access aisle and the parking stalls serviced by that
aisle are part of the module.
Outlying Business District-- commercial area generally removed by a mile or more
from a central CBD.
Parking Accumulation-- the total number of vehicles parked in a specific area
(usually segregated by type of parking facility) at a specific time.
Parking Demand-- the number of vehicles with drivers desiring to park at a
specific location or in a general area. It is usually expressed as the number of vehicles
during the peak-parking hour.
Parking Space or Stall-- an area large enough to accommodate one parked vehicle
with unrestricted access (no blockage by another parked vehicle).
Parking Supply-- the number of spaces available for use, usually classified by
on-street curb (metered and unmetered), lot and garage. Further differentiation of the
types of parking is useful, such as those available to the general public, and private
spaces earmarked for a specific purpose such as loading.
Parking Volume-- the total number of vehicles that park in a study area during a
specific length of time.
Partial Module-- one access aisle combined with a single one-side row of
parking.
Short Term Parking-- parking with a duration of three hours or less.
Stall Length-- The longitudinal dimension of the stall, normally 18.5 feet.
Stall Width-- The width of each parking space as measured crosswise to the
vehicle. The most common width is 8.5 to 9.0 feet.
Study Period-- the time during which the parking study is conducted, usually
between 10:00 A.M. and 6:00 P.M. Increasing emphasis, however, is being placed on
inclusion of the morning and evening periods within the length of the study. Certain uses,
such a theatres, may peak in the evening hours, while residential parking demand peaks
around 3:00 A.M.
Trip Purpose-- the primary reason for the individuals journey to the study
area. Typical purposes include shopping, working, business, and recreation.
Turning Radii-- The radius of the circle that is traveled by the design vehicle
when completing a turn. Large turning radii should be provided. These are a function of
the parking angle and end island design, but in general the turning radii should be at
least 18 feet.
Turnover-- the number of different vehicles parked at a specific parking space
or facility during the study period. Parking turnover measures utilization.
Van Accessible-- a parking space that is at least 8 feet wide, with a minimum
access aisle of 5 feet along the right side of the parking space.
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