ISATe is another HSM Excel-based spreadsheet tool developed by FHWA to help practitioners implement the HSM Part C predictive method for freeways, ramps, interchanges, and collector-distributor (C-D) roads, as identified in Chapter 18 and Chapter 19 of the HSM. ISATe is intended to help agencies make informed decisions related to the safety performance of design alternatives and changes to existing freeway systems. The ISATe spreadsheet and user manual can be downloaded from AASHTO’s HSM website, which is located in

Appendix G, Section 5 – External References (Reference 3)

. Data entry and segmentation for ISATe is very similar to the HSM Spreadsheets.