Were the rumble strips effective in reducing average speeds

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A before-and after speed study was conducted to determine the effectiveness of a series of rumble strips installed approaching a toll plaza to reduce approach speeds to 40 mi/h.
(a) Were the rumble strips effective in reducing average speeds at this location?
(b) Were the rumble strips effective in reducing average speeds to 40 mi/h?

Reference no: EM13310185

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