TRB's second Strategic Highway Research Program (SHRP 2) Report S2-S04A-RW-1: Naturalistic Driving Study: Development of the Roadway Information Database documents efforts to design, build, and populate a Roadway Information Database (RID) encompassing data from the SHRP 2 mobile data collection project (S04B), other existing roadway data, and supplemental traffic operations data. The RID was designed to provide data that are linkable to the SHRP 2 Naturalistic Driving Study (NDS) database and accessible using GIS tools.