State Highway 128, Wisconsin

From IHSDMDownload

User Information

Organization/Agency: Fleming, Andre and Assoc., Inc.

Basic Project Information

Project Name/Description: State Trunk Highway 128 Benefit/Cost Analysis

Nature of the Project/Study: 3R Safety Improvement

Project Location: Saint Croix County, Wisconsin, Glenwood City to State Trunk Highway 64

Highway Length: 5.4 mi

Functional Classification: Minor Arterial

Design Speed: 60 mi/h

Posted Speed: 55 mi/h

Terrain Type: Half Rolling, Half Level

Application of IHSDM

IHSDM Module(s) used:

• Crash Prediction

Purpose of using IHSDM on this project:

IHSDM was used to estimate the expected levels of crash reduction for two design alternatives as compared to a base case.

STH 128 is the worst of a group of highways with high crash rates and with a very high percentage of run-off-road crashes. Results of this study will provide the basis for a program to prioritize HES/HSIP projects in an equitable manner.

Stage(s) of the project development process in which IHSDM was applied (e.g., planning, preliminary design, final design, etc.):

Planning

How IHSDM results were used to make design decisions:

IHSDM results were used to predict the level of crash reduction of various alternatives. IHSDM provided much of the basis for the “benefit” side of the benefit-cost analysis.