PROBLEM TO BE SOLVED: To solve the problem in which a technique is requested that retrieves travelling routes to be targeted for travelling with high reliability.SOLUTION: A route retrieval program, which finds out a guide travelling route serving as a travelling object of a service car, is configured to make a computer serve: a retrieval area setting function that sets a fan-shape area broadening in a progression direction of an own car reference point serving as a prescribed reference point in the service car； and a guide route selection function that selects a travelling route candidate nearest to the own car reference point in a retrieval area as the guide travelling route serving as the travelling object of the service car, of a plurality of travelling route candidates read from a travelling route storage unit having a plurality of travelling routes stored.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】走行目標とすべき走行経路を高い信頼性で探索する技術が要望されている。【解決手段】作業車の走行目標となる案内走行経路を見つけ出す経路探索プログラムは、作業車における所定基準点である自車基準点の進行方向に広がる扇形領域を探索領域として設定する探索領域設定機能と、複数の走行経路を格納する走行経路格納部から読み出された複数の走行経路候補のうち、探索領域内において最も自車基準点に近い走行経路候補を作業車の走行目標となる案内走行経路として選択する案内経路選択機能とをコンピュータに実現させる。【選択図】図１
