It would also include downgrading the existing Huntingdon A14 viaduct from a trunk road and providing two new roads for local traffic between Trinity Foot and a new Girton interchange.

BBC: A14 Cambridgeshire: lower toll favoured by study

Rush-hour delays and longer commuting times for people who live near Birmingham Interchange or Euston station in London could result as the volume of traffic is set to increase, and again it is difficult to estimate the precise economic cost, the IEA reasons.

BBC: HS2 cost and benefit debate not over