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OCR for page 67
Attributes of Successful Ground Access Systems 67
· Regional coverage/traveler characteristics. The proportion of air travelers whose trip end is
near the bus stops/stations is important. The degree of population density and automobile
ownership may also influence the use of door-to-door service. For example, the proportion of
travelers using shared-ride vans at San Francisco International Airport is much higher than
the proportions at Oakland or San Jose airports, perhaps because of the greater population
densities and lower automobile ownership rate in San Francisco.
What's Next?
Understanding the logic of high market shares requires a case-by-case examination of both
systems that are performing well and systems that are performing poorly. Using the most basic
measure of performance--market share to public transportation, 46 airports around the world
are examined in detail in Chapter 4. Chapter 5 then reviews known ridership impacts of strate-
gies to integrate baggage check-in/handling and ticketing across modes.
Documentation of the desired attributes of good service is clearly important. However, once
documented, the service attributes per se clearly cannot explain the variations in the public trans-
portation market, particularly when examined on the basis of the total airport market. A process
to document both the geographic distribution of market segments and the demographic distri-
bution of market segments is needed to understand the extent to which a given service is
succeeding or failing in terms of the market for which it was designed. This task will be addressed
in Chapter 6.
