The purpose of this chapter is to provide guidance on the different types of data available for traffic and safety analysis, preferred methods of data collection, existing sources of data, and data needed for the different levels of analysis.

This chapter provides generalized data requirements for traffic operational analysis. There may be additional analysis-specific data requirements not covered in this chapter. For data specific to facility type or analysis type, such as intersections, interchanges, roundabouts, and microsimulation, see

Chapters 10

,

11

,

12

, and

13

, respectively.