Statistical models of expected crash frequency are referred to as Safety Performance
Functions (SPFs) in the first edition of the American Association of State Highway and …

Statistical models of crash frequency typically apply univariate regression models to
estimate total crash frequency or crash counts by various categories. However, a possible …

Negative binomial (NB) regression is among the most common statistical modeling methods
used to model crash frequencies due to its simple functional form and ability to handle over …

Abstract The American Association of State Highway and Transportation Officials' Highway
Safety Manual (HSM) contains safety performance functions (SPFs) to predict annual crash …

Single-vehicle crashes are overrepresented on rural two-lane highway curves. While prior
work investigated the relationship between crash occurrence and aggregate curve …

This study involved the development of safety performance functions (SPFs) for rural road
segments and intersections in the state of Michigan. The facility types included two-lane and …

Conventional intersection designs are known to be problematic and unreliable when
handling the complexity associated with the heavy traffic volume and travel demand on …

Abstract The American Association of State Highway and Transportation Officials' Highway
Safety Manual (HSM) includes a collection of safety performance functions (SPFs) or …

Recent studies have proposed using well-defined relationships between network
productivity and accumulation—otherwise known as Network or Macroscopic Fundamental …

The first edition of the Highway Safety Manual (HSM) contains a simplistic version of the
crash prediction model for two-way stop-controlled intersections (TWSC) on rural two-lane …