Why it matters: The works will affect the key route until October, with the latest closures moving in phases along the 1.1 mile stretch of road.
Gas distributor Cadent said it is replacing "ageing metallic gas pipes" dating from 1907 with "tough new plastic ones".
What they're saying: Project manager Gary Tidman said: "We know it's far from ideal to have any sort of road closures or traffic management in place in what is a busy area, but we have worked hard with the local authorities to create a plan that keeps traffic flowing and maintains access for local businesses and residents."
"We are also making use of the school half-term and summer holidays to keep disruption to a minimum, but we will continue to work with the Highways Agency to ensure that they are happy with the progression we are making and the plans that are in place."
The bottom line: The work will be carried out in phases to minimise disruption, with completion expected in October.
