In a section where there is a "road construction" warning sign, you must slow down to a stop-ready speed (jokō) in all cases, and failure to do so is a violation.

Answer: False

Explanation

Warning signs give advance notice of hazards or situations requiring attention on the road and call for caution, but they do not directly impose an obligation to slow down to a stop-ready speed. You must travel at an appropriate speed according to the construction conditions and other signs, road markings, or instructions from traffic control personnel, but it is not stipulated that you must slow down to a stop-ready speed "in all cases."