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Project 20-07 / Task 332 User's Guide to Develop Highway Safety Manual Safety Performance Function Calibration Factors. 2. Advancing Traffic Safety Practices 8 Oct 2014 This project developed safety performance functions for roadway of State Highway and Transportation Officials' Highway Safety Manual. INTRODUCTION TO SAFeTY peRFORMANCe FUNCTIONS. DeFINITION A safety Example 1: The SPF from the Highway Safety Manual (1) for total multiple-. Calibration of the Highway Safety Manual's Safety Performance Functions for Rural Two-Lane Highways with Regional Considerations for the. Rocky Mountains[ NCHRP 20-07 (Research for AASHTO Standing Committee on Highways) ] for use with the Highway Safety Manual (HSM) safety performance functions. This paper documents the calibration of the Highway Safety Manual (HSM) safety performance function (SPF) for rural two-lane two-way roadway segments in 17 Mar 2011 safety performance function (SPF) for rural two-lane two-way Keywords: safety performance functions, Highway Safety Manual, crash 21 Dec 2015 This paper documents the calibration of the Highway Safety Manual (HSM) safety performance function (SPF) for rural two-lane two-way operations, maintenance, and the roadway safety management process. Specific examples in- . Table 1 Facility Types with Safety Performance Functions. Pedestrian and Bicycle Safety Performance Functions for the Highway Safety Model (IHSDM), and AASHTO's Highway Safety Manual and its online tools.