Surveys are commonly implemented at the trail-, corridor-, or community-level. They can be conducted over the phone, in-person, or via the internet; each method has different cost and response implications. The length of the survey matters, with short surveys providing limited information but yielding higher rates of response than longer surveys.
The geographic scope for the survey will depend on the specific purpose of the data collection effort. For examples of surveys, see pages 92 to 120 of the FHWA report, Pedestrian and Bicycle Data Collection in United States Communities: Quantifying Use, Surveying Users, and Documenting Facility Extent.