Guide to Calculating Mobility Management Benefits Victoria Transport Policy Institute
There are often several steps between a mobility management policy or program and its ultimate benefits, as illustrated in Figure 1. For example, a particular strategy may improve transit service, causing some travelers to shift mode, which reduces traffic congestion, thereby increasing economic productivity. Mobility management evaluation requires understanding these various relationships, some of which are complex and difficult to measure. For example, although we are confident that improving transit service can increase transit ridership, it can be difficult to predict the magnitude of mode shifting, congestion reductions and economic productivity gains.
Steps Between Policy or Program and Ultimate Benefits Policy or Program
(fuel tax reform, commute trip reduction program, increased transit f u n d i n g , p e d e s t r i a n p l a n n i n g , e t c . ) Ð Incentives (higher fuel prices, parking cash out, better transit services, improved walking conditions, etc.) Ð Travel Changes Ð Land Use Changes
(shifts in travel time, mode, destination, frequency, etc.)
(reduced parking supply, more compact development, more land use mix, etc.) Ð
Direct Physical Effects (reduced congestion, reduced accidents, reduced pollution emissions, improved mobility for non-drivers, etc.) Ð Ultimate Economic, Social and Environmental Benefits (increased economic productivity, improved health, ecological integrity, increased opportunity for disadvantaged people, etc.) Ð Monetization of Impacts (measuring impacts in monetary units for economic evaluation)
This figure illustrates the various steps between a particular mobility management strategy and its ultimate effects and benefits.
These impacts often change over time. Highway capacity expansion tends to reduce traffic congestion in the short-term, but this benefit declines over time due to generated traffic (additional vehicle travel resulting from roadway improvements). On the other hand, mobility management benefits are often slow to develop but increase over several years as people take these changes into account when making decisions such as where to locate and whether to purchase another vehicle. Shorter-term analysis therefore tends to favor highway capacity expansion, while longer-term analysis tends to support more mobility management.