Civil Engineering Reference
In-Depth Information
Fig. 10.2 Door-to-door trip
components
Figure
10.2
illustrates a trip distance from origin [O] to destination [D] using two
line-haul transit lines, with access at [1], requiring a transfer at [T], and an egress at
[2] for access to a destination at [D].
The travel time components for this trip are shown in Fig.
10.2
and summarized
in Table
10.1
.
In-vehicle Travel Time
This time is calculated by dividing the distance traveled in a vehicle by the
average vehicle speed:
The average private vehicle speed is a function land use density, road design
speed and traf
c volume. For public transportation vehicles, the average speed is
also affected by service patterns, bus stop/station frequency, dwell times and rights-
of-way.
Typical average modal speeds in a large urban area are shown in Table
10.2
.
Operating speeds of rapid transit and commuter-rail lines range between about
20
30 miles/h.
-
Table 10.1 Time components of the door-to-door trip in Fig.
10.2
Trip components
Out-of-vehicle travel
time
In-vehicle travel time
Access to or from
line-haul vehicle:
Walk time
Time in auto, bus, or bicycle to [1] or
from [2], if distance to/from line-haul
is beyond walk distance
Wait time
[O]
[1]
-
[2]
[D]
-
Line-haul vehicle
For multivehicle trips:
Time riding the main line vehicle
(transit or auto)
[1]
[T]
Transfer walk time
-
[T]
[2]
Transfer waiting time
-
Total
Out-of-vehicle time
In-vehicle time
Source Fig.
10.2
