Surrogate Safety Assessment Model (SSAM), TechBrief

Gettman, Douglas; Shelby, Steven; Siemens ITS

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Surrogate Safety Assessment Model (SSAM), TechBrief

2008-05-01
By Gettman, Douglas ; Shelby, Steven

[PDF-220.73 KB]

English

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Creators:

Gettman, Douglas ; Shelby, Steven

Gettman, Douglas ; Shelby, Steven Less -
Corporate Creators:

Siemens ITS
Corporate Contributors:

Turner-Fairbank Highway Research Center ; United States. Federal Highway Administration. Office of Research, Development, and Technology

Turner-Fairbank Highway Research Center ; United States. Federal Highway Administration. Office of Research, Development, and Technology Less -
Subject/TRT Terms:

[+]

Collisions Highway Safety Intersections Intersection Safety Microscopic Traffic Flow Simulation. Surrogate Safety Measures Traffic Accidents Traffic Conflicts Traffic Safety Traffic Simulation
Publication/ Report Number:

FHWA-HRT-08-049;HRDI-05/05-08(3M)E
Resource Type:

Tech Report
Geographical Coverage:

United States
Corporate Publisher:

United States. Federal Highway Administration. Office of Research, Development, and Technology
Abstract:

A conflict is a scenario where two road users will likely collide without evasive action.

illustrates an example of a conflict, where a vehicle is angling across two lanes to the left-turn bay and has abruptly cut in front of another vehicle that must decelerate to avoid collision. Traffic conflicts have been studied since the late 1960s as a technique to assess the safety of a location, with the understanding that conflict frequency is correlated with the risk of actual collision.

Conflict studies traditionally utilize personneltrained to identify and record conflicts observedat an intersection. In this research, the SSAM software application was developed to automate conflict analysis by directly processing vehicle trajectory data. Researchers specified an openstandard, “universal” vehicle trajectory data format designed to provide the location and dimensions of each vehicle approximately every tenth of a second. It is hoped that video processing technology will, in the coming years, be capable of automatically extracting vehicle trajectory data adequate for SSAM processing.

However, the trajectory file format is currently supported as an export option by four traffic microsimulation models: VISSIM, AIMSUN, Paramics, and TEXAS.
Format:

PDF
Collection(s):

Federal Highway Administration US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:29777aca39bc7a970673b9b4d85a94dcb72122a6e93fa70916a59dece3de34d9
Download URL:

https://rosap.ntl.bts.gov/view/dot/35830/dot_35830_DS1.pdf
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Surrogate Safety Assessment Model (SSAM), TechBrief

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