PROBLEM TO BE SOLVED: To provide a technology to reduce the possibility that disruptions are caused to a transportation plan.SOLUTION: A pre-driving warning system includes an acquisition part 21a for acquiring alcohol concentration in the blood of a driver of a transportation vehicle, a prediction part 21b for acquiring a reference time based on a scheduled time when the driver is scheduled to start driving the transportation vehicle, and predicting whether or not the alcohol concentration in the blood becomes a reference value or less by the reference time based on temporal reduction characteristics of the alcohol concentration in the blood in the past, and a warning part 21c for issuing a warning when it is not predicted that the alcohol concentration in the blood becomes a reference value or less by the reference time.SELECTED DRAWING: Figure 1【課題】送計画に乱れが生じる可能性を低減する技術の提供。【解決手段】本発明の運転前警告システムは、運送車両の運転者の血中アルコール濃度を取得する取得部２１ａと、前記運転者が前記運送車両の運転を開始する予定となっている予定時刻に基づいて基準時刻を取得し、過去における前記血中アルコール濃度の経時的な減少特性に基づいて、前記血中アルコール濃度が前記基準時刻までに基準値以下となるか否かを予測する予測部２１ｂと、前記血中アルコール濃度が前記基準時刻までに前記基準値以下となると予測されない場合、警告を行う警告部２１ｃと、を備える。【選択図】図１
