The main objective of this study was to estimate the speed impact of occasional hazard (playground) warning
(OHPW) signs along residential streets. Three types of data were collected at each of three study sites
approximately one month before and one week to one month after the installation of a pair of OHPW signs.
Vehicle speed data were collected with a pneumatic tube device. Manual observations were recorded, and focused
on the magnitude and location of the on-street parking and park and/or playground activities occurring at the study
sites. Linear regression analysis was used to estimate the change in mean vehicle speed associated with the
presence of the OHPW signs, while controlling for the effects due to activity levels on the streets and the
playgrounds. At one site the OHPW sign had no discernible effect on mean vehicle speeds, while at the other two
sites mean vehicle speeds decreased by 1.5 mph and 0.9 mph following installation of the OHPW signs.
Civil Engineering Department, University of Minnesota; Iowa Local Technical Assistance Program, Institute for Transportation, Iowa State University
Davis, Gary; Knapp, Keith K.; Hourdos, John.
Vehicle Speed Impacts of Occasional Hazard (Playground) Warning Signs.
Minnesota Department of Transportation.
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