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This is the statute in Alabama which governs speeding in a construction zone:
Alabama Code - Section 32-5A-176.1: SPEED LIMITS IN CONSTRUCTION ZONES
(a) The State Department of Transportation may set the speed limits in urban and rural construction zones along state and interstate highways and the county commission of a county may set the speed limits in urban and rural construction zones along county roads or highways. The construction zone speed limits shall be posted on the department's standard size speed limit signs at least one hundred feet in advance of the entrance to a construction zone. Law enforcement authorities shall enforce construction zone speed limits. Upon conviction of a construction zone speed violation, the operator of the motor vehicle shall be assessed a fine of double the amount prescribed by law outside a construction zone. The fine shall only be doubled for construction zone violations if construction personnel are present and that fact is indicated by appropriate signs. The signs, placed at the entrance of the construction zone, shall warn of the doubled fines for speeding within a construction zone. The signs shall also state that the doubled fines are applicable only when construction personnel are present.
So the fine should only be doubled if construction personnel are actually present. What you should do is try to find the construction company that is working at the site, tell them the time you were pulled over and get evidence from them as to whether or not someone was present and working at the construction site during that time.
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