Visibility and Speed Estimation of Iowa State Highway Commission Snowplows, HR-174, 1975

(1975) Visibility and Speed Estimation of Iowa State Highway Commission Snowplows, HR-174, 1975. Transportation, Department of

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Abstract

Many accidents involving Iowa snowplows have happened in recent years. This study investigated the influence of time of day, sex of subject, type of snowplow sign and snowplow speed on the criteria of oncoming driver reaction time and his estimate of snowplow speed. Film strips were made of a car passing a snow-Plow under various experimental conditions. These experimental movie strips were viewed in the laboratory by college student drivers who were asked to indicate their reaction time to slow down and to estimate the speed of the snowplow being passed. The generally best sign condition for the snowplow was to have a striped rear sign and a speed-proportional flashing light in addition to the standard rotating beacon on top of the truck. Several recommendations were made.

Item Type: Departmental Report
Keywords: Laboratory tests, Safety factors, Snowplows, Speed measurement, Traffic safety, Visibility distance
Subjects: Transportation
Transportation > Motor vehicles
Transportation > Roads and highways
Transportation > Traffic safety
Transportation > Environment
Transportation > Environment > Weather and climate
ID Code: 17283
Deposited By: Iowa DOT Library
Deposited On: 30 Jun 2014 12:37
Last Modified: 29 Jan 2015 21:10
URI: http://publications.iowa.gov/id/eprint/17283