Evaluating the Effectiveness of Dynamic Speed Display Signs
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2012-09-01
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Edition:Final report.
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Abstract:This study investigates the impact of dynamic speed display signs (DSDSs) on drivers’ speed-related
behavior. A survey questionnaire regarding attitudes and reactions to DSDSs on different road
classes was distributed to Maryland drivers of different ages and socioeconomic backgrounds. In
addition, the research team collected vehicle speed data upstream and downstream of the DSDS
location on different corridors. The data was collected with a portable Trax Flex High Speed
Counter, which records vehicles’ length, speed, and number of axels as they pass over the device’s
tubes on the road. The speed data was collected on three roads with different speed limits: 25 mph,
35 mph, and 45 mph. Conventional statistical analysis, Bayesian network, and planned behavior
theory were applied to assess the DSDS’ effectiveness with reducing speed. To investigate the shortterm
and long-term effects of the DSDS, the research team collected the data in different periods
(few days to few months) after the installation. Furthermore, the effective distance for the DSDS was
investigated. Two different sizes of the DSDS were used to find the impact of size on drivers’
compliance.
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