@article{ref1,
title="Signs as deterrents of illegal parking in spaces designated for individuals with physical disabilities",
journal="Journal of applied behavior analysis",
year="1991",
author="Cope, J. G. and Allred, L. J. and Morsell, J. M.",
volume="24",
number="1",
pages="59-63",
abstract="The percentage of illegal parking in spaces reserved for the physically disabled was monitored under three sign conditions: ground markings, ground markings plus vertical signs, and vertical signs containing a message that concerned citizens were watching the spaces. Illegal parking dropped from 69.3% of 102 vehicles during the initial ground-sign condition to 57.3% of 36 vehicles in the first vertical-sign condition. Following removal of the vertical signs, illegal parking increased to 68.7% of 43 vehicles. During the second vertical-sign condition, illegal parking dropped to 53.7% of 32 vehicles, followed by an increase to 69.5% of 68 vehicles after the vertical signs were removed. The lowest rate of illegal parking (27.1% of 78 vehicles) occurred in the vertical sign-plus-message condition. Illegal parking subsequently increased to 34.6% (of 94 vehicles) when the message sign was removed, followed by an increase to 65.2% (of 105 vehicles) when the vertical signs were removed.<p /> <p>Language: en</p>",
language="en",
issn="0021-8855",
doi="10.1901/jaba.1991.24-59",
url="http://dx.doi.org/10.1901/jaba.1991.24-59"
}