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Pages 8-9

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From page 8...
... First, a web search was conducted to identify articles, reports, or media accounts of public opinion results on tolls and road pricing. Second, searches of CD-ROMs containing papers presented at TRB annual meetings and of Transportation Research Information Services (TRIS)
From page 9...
... External validity refers 10 to the generalization of research findings, and our sample of surveys and focus groups were not randomly selected from the full set that had ever been conducted on this topic. However, because our review was successful in compiling a broad and diverse range of surveys and focus groups, the data represent a good cross section of public opinion on tolling and road pricing.


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