本設計提出一款置於廢土情境下的「回程載具」，核心概念為「可回程性（Returnability）」，重新定義移動的目的不在於突破與探索，而在於確保行為可逆與安全返回。在高度不確定且充滿風險的水陸邊界環境中，傳統載具依賴使用者判斷，容易因過度操作而陷入不可回復的狀態。本設計透過「行為限制系統（Behavior Constraint System）」介入操作流程，將使用者輸入轉化為可控行為，避免高風險決策的發生。系統將操作分為輸入、過濾與輸出三階段，主動限制急加速與劇烈轉向等不穩定行為，並於過渡狀態中自動調整推進與穩定機制，使載具維持低速、穩定且可回程的移動模式。此設計並非提升性能，而是透過限制行為選項，讓錯誤選擇不再存在於系統之中，從而建立一種以安全與回返為優先的移動策略。
This project presents a personal amphibious vehicle centered on the concept of Returnability, redefining mobility as a risk-managed process. Instead of emphasizing speed or exploration, the design ensures that all movement remains safe and reversible.
A Behavior Constraint System filters user input before execution, removing unsafe actions rather than relying on user judgment. Through stages of input, constraint, and output, aggressive behaviors are limited or redirected, especially during land–water transitions where stability is critical.
By constraining behavior instead of enhancing performance, the vehicle keeps all actions within a safe, returnable range, embedding safety directly into the system.
