An agency can respond to survey results by providing missing or inadequate information that did not get through to the public or was misinterpreted. This adds to the substantive discussion of issues deemed important by respondents. Surveys focus public thoughts about a service and provide a context for an opinion. A public opinion survey in Chicago found that public attitudes about transit are not only a function of services received but are also strongly affected by people's feelings about crime, government in general, public civility, and the neighborhoods where a trip begins or ends. The surveys helped the DOT determine what attendees thought of ideas under discussion and present project issues in ways that engaged them.
Surveys indicate preferences of segments of the population.
In Utah the Wasatch Front Regional Council and the Utah Transit Authority conducted a survey of more than 2,000 individuals to determine transportation preferences for disabled persons. Santa Barbara, California, used a public opinion survey in conjunction with the update of its general plan to identify issues of particular concern to Hispanic and African-American business people and community leaders. Lancaster County, Pennsylvania, used a visual preference survey to determine physical aspects and patterns that residents preferred and to show how those values could be reflected in an overall plan for the area. Surveys directly involve a relatively small population of a State or region. For surveys with a randomized sample of the population, chosen in a statistically-valid way, the sample can be stratified to include only people within a specific geographic area, income group, or other category of people from whom information is desired.