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  Lower Thames Crossing - Choosing by Advantage for a Sustainable Tunnel Solution

  Sustainability including economic, social and environmental aspects, governs many aspects when planning a major tunnel crossing. Multicriteria analysis is often used to evaluate alternatives to help decisionmakers handle sustainability issues and Choosing by Advantage is such a method. In this paper we will first present the method. Then a case study will present how this method was used in the early phases of a major tunnel project, Lower Thames Crossing, to decide on one of the overall alignment aspects, while covering a wide range of disciplines. The project is a planned large-diameter bored tunnel under the River Thames east of London (UK). The project consists of a coast-to-coast part and connecting road network. Choosing by Advantage provides clarity and decisions are documented systematically. The method has been shown to create a common understanding between client, stakeholders, planners and designers to reach decisions collaboratively across many different disciplines, reducing long-term impacts on society and nature.

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