Civil Engineering Reference
In-Depth Information
Table 10.2 Typical average
line-haul speed of on-street
travel modes in a large
metropolitan area
Mode
Urban (mph)
Suburban (mph)
Walk
3
3
Bicycle
8
12
Bus (mixed traf
c)
10
-
12
12
-
15
Automobile
15
-
20
25
-
30
Source Estimated
Illustrative Example
Table
10.3
shows an example of typical average speeds and excess travel times
for selected urban travel modes that do not require transfers. Values for speci
c
cases, however, would depend on actual transit schedules or service areas, route
structures, and the number of transfers required to complete the trip.
Notes for Table 10.3
:
(1) Actual average mode speed is typically determined by the volume of traf
cin
the road network, the roadway
'
s design speed and capacity, and the opera-
tional characteristics of the mode (e.g., local or express bus; on local or arterial
road, freeway, etc.).
(2) Access to and from the bus mode assumes an average walk distance of 0.25
miles for each trip segment.
(3) Waiting time is assumed
the vehicle headway.
½
(4)
In addition to the above components of excess travel time, travelers also
consider the travel time reliability of the individual travel modes. When using
a mode that is subject to random but signi
cant delays, excess travel time
would be larger than what is shown in the table.
The travel time of an urban trip made by bicycle or by a private motor vehicle
typically does not include signi
But the excess
time components of urban trips by transit can be typically a signi
cant
“
excess time components.
”
cant share of
door-to-door travel time.
Table 10.3 Typical average speed and excess travel time for line-haul modes
Line-haul mode
Average speed
of line-haul
mode (mph)
Excess travel time (min)
Vehicle
access
Waiting
time
Destination
access
Total
Walk
3
-
-
-
0
Bike
8
12
0
0
-
-
-
Urban
Suburban
Bus
local/
surface
Urban
12
5
3
5
13
Suburban
15
5
8
5
18
Auto
Urban
20
1
2
3
6
Suburban
30
1
1
1
3
Source Estimated
