ABSTRACT
The objective of this chapter is to provide an overview of trafc data collection that can and should be used for the calibration and validation of trafc simulation models. There are big differences in availability of data from different sources. Some types of data such as loop detector data are widely available and used. Some can be measured with additional effort, for example, travel time data from GPS probe vehicles. Some types such as trajectory data are available only in rare situations such as research projects.
