有鑑於近年來台灣東西部經濟發展的落差日鉅，大都會交通便捷網的向外延伸，已經成爲政府與民眾關切的公共議題。本研究以北宜高速公路之「雪山隧道動工」爲例，援引歷來長隧道運輸便捷化的國內外區域規劃經驗，進行區域內長期發展的評估、先期預測、以及因應策略設計。本文評估主要採用「先例分析法」與「策略階段論」等兩種方法，且考慮公共工程宣布開工後對於完工的預期，採以廣域的角度，探討何以當時區域規劃的持續「擴大與調整」理由。最後，由本文的評估結果顯示，目前蘭陽地區的社經發展，未見著樂觀推演的「U」型論，卻已面臨著長過渡時期。宜趁此準備起飛的階段，儘速檢討已「折價」的原規劃揭示目標，擬妥此區域發展的「新的擴大與調整」計畫，期因應此條世界級長隧道高速公路所帶來全新的社會衝擊。

Due to the rising regional disparity caused by recent urban-rural discrimination events, the trans-regional transportation projects have become most concerns for the public and their government. This paper supplements the cross-region social assessment of U-typed manpower movement by the related foreign experiences, using the Taiwan's Shea-San Tunnel as an example. The precedent development and strategic stage are introduced as another critical method in conjunction with the data of net migration. Our results indicate that the outcome of the above U-typed manpower movement is insignificant. Finally, the new planning considering a tremendous chasm stage is offered to derive the optimal regional development, aiming at improving the social impacts of the insignificant and unexpected U-typed movement.