Campaigning in Oxford this week, Shapps said: "The benefits of this project were always finely balanced against its costs, both financial and environmental.
"If re-elected we will review as a priority this scheme to ensure that it is still worth going ahead. We will not allow the scheme to proceed if there is not a strong case that it will boost jobs, prosperity and has local support.”
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However, Shapps went on to say that a Conservative government would “develop this important strategic corridor which will be a driver of future prosperity, investing in the new east-west rail link, local roads and new cycling schemes."