2.3.4 Resources for Performance Based Analysis

AASHTO’s Highway Safety Manual (HSM)

is the most prevalent resource for performance-based methodology. Other PBD resources have been developed and continue to be developed through research. Such resources include:

Interactive Highway Safety Design Model (IHSDM)

– Federal Highway Administration (FHWA);

Highway Capacity Manual (HCM)

– Transportation Research Board (TRB), 2016;

NCHRP Report 687 Guidelines for Ramp and Interchange Spacing

, 2011;

NCHRP Report 839 A Performance-Based Highway Geometric Design Process

, 2016; and

Traffic and Safety Analysis Procedures Manual (TSAP)

– Texas Department of Transportation (TxDOT), 2024.

2.3 Performance-Based Design Process