Civil Engineering Reference
In-Depth Information
Safety
: Travelers prefer modes that they perceive to be safe, and avoid those that
they perceive to be unsafe.
The
perceived safety
of using the mode re
fl
ects:
probability of personal injury,
probability of fatality,
risk to personal security.
Barrier-Free Access
: vehicle entry/exit
that allows access to the physically
disabled.
Comfort/Convenience
—
Includes the following variables:
Walking distance
Number of transfers
Frequency of service
Waiting time for vehicle (
“
it
'
s not just how long you wait; it
'
s how you spend
the time waiting
”
)
Physical comfort: cleanliness,
temperature and humidity, cleanliness,
ride
quality, space per passenger, weather protection
Psychological comfort: sense of being in control, availability of real-time
information
Availability of vehicle parking
Availability/dependability of travel mode
Ability to carry packages, tools, etc. when needed.
10.2.3.1 Door-to-Door Travel Time and Speed
The door-to-door trip speed of each travel mode is a key measure of modal
mobility, and it depends on the door-to-door trip distance and trip time. It is
expressed as follows:
Door
to
Door Travel Speed
¼
ð
Þ
=ð
Door
to
Door Travel Time
Þ
Door
to
Door Trip Distance
ð
10
:
1
Þ
Door-to-door trip time is typically the sum of (1) vehicle riding/driving time, and
(2)
or excess time. Excess time represents the time spent outside
the vehicle. It includes the walk time from the trip origin to the vehicle location,
waiting time for the vehicle, transfer time from one vehicle to another for trips
involving multiple vehicles, and walk time from one leaves the vehicle to the trip
destination.
This distinction in travel time components is important because travelers value
the out-of-vehicle time 2
“
out-of-vehicle
”
2.5 times the time spent riding the vehicle. The exception
is across the platform transfer at rapid transit stations.
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