Boston's massive jacked tunnels set new benchmark

British tunnel-jacking expertise contributed to savings of over US$300 million on the vast project to build Boston's new subterranean highway network. The change from traditional cut-and-cover construction to tunnel jacking in frozen ground enabled three full-size interstate highway tunnels—totalling over 240 m in length—to be built in heavily obstructed ground under the approaches to a busy railway station with no disruption to service. The scale of the work was unprecedented, being several times larger than any tunnel-jacking project previously undertaken. It has set a new benchmark for the technique and further raised its profile as an effective and sustainable solution for creating new urban infrastructure.