Civil Engineering Reference
In-Depth Information
P
0,0
= Initial User Trip Cost
P
1,1
= Future Year User Cost with Expanded Capacity (S
1
) and Future Year Demand (D
1
)
Fig. 17.16
Effect of capacity expansion on land development growth and related new trips
improved route to (D1) and will add new trips [(V
1,1
)
(V
1,0
)] to the improved route
-
(Fig.
17.16
).
Because the growth in land use activities attributable to the improved route
represents a share of future development growth (that probably would have located
in other parts of the metro area if the route
s capacity remained unchanged), the new
trips induced by the improved route might not represent a net increase in trips for
the metro area, unless it attracts development that would have otherwise located in
areas accessible by transit.
As shown in Fig.
17.16
, the demand function (D1) generated by the growth of
land development induced by the improved roadway, will add traf
'
c volume to the
improved road (V
1,1
) which, in time, will reach the same congestion level as it
existed when the road was at its original capacity (P
1,1
)=(P
0,0
). This induced traf
c
volume can have both positive and negative consequences:
(Footnote 1 continued)
quality of schools and other public services; and zoning ordinances that determine the type,
density, and location of development.
