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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.