Effectiveness of Roadway Safety Improvements, 2001

(2001) Effectiveness of Roadway Safety Improvements, 2001. Transportation, Department of


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The Iowa Department of Transportation (DOT) continuously assesses the likely causes of crashes at high-crash locations throughout the Iowa roadway network and designs solutions to reduce the incidences of crashes. This research analyzed approximately 100 safety projects constructed in the past 10 years to see what affect they had on highway safety. The projects are grouped into seven categories as defined by their scope of work: (1) install new traffic signal, (2) add turn lane(s), (3) install new signal and turn lane(s), (4) add left-turn phasing, (5) add left-turn phasing and turn lane(s), (6) replace pedestal mount signals with mast arm signals, and (7) other geometric improvements. The project makes use of an extensive statewide crash database. The results of the project will evaluate the assumed reduction factors and benefit/cost (B/C) analysis, determine the actual cost effectiveness of the Iowa DOT's safety programs, and allow the Iowa DOT to better prioritize future improvements.

Item Type: Departmental Report
Keywords: Benefit cost analysis, Cost effectiveness, Crash data, Databases, Highway safety, Improvements, Left turn phase, Measures of effectiveness, Roads, Safety, Safety programs, State departments of transportation, Strategic planning, Traffic crashes, Traffic safety, Traffic signals, Turning lanes
Subjects: Transportation
Transportation > Social impacts
Transportation > Traffic safety
Transportation > Traffic safety > Accident report forms
Transportation > Research
ID Code: 21304
Deposited By: Iowa DOT Library
Deposited On: 06 Jan 2016 12:56
Last Modified: 06 Jan 2016 12:56
URI: https://publications.iowa.gov/id/eprint/21304