No person shall operate a powercraft within or through a designated speed zone, ski zone or unzoned area designated for combined speed boating and water skiing as provided in rule 1501:41-11-02 of the Administrative Code, between the hours of sunrise E.S.T. to sunset E.S.T. at a greater speed than is reasonable, having due regard to traffic, surface and any other hazardous conditions then existing within such zones, but from sunset E.S.T. to sunrise E.S.T. watercraft speed shall not exceed ten miles per hour within or through said zones.