Reading the notice, it appears to me that the whole project will take from Nov 20 to (approx) Jly 22.
My interpretation is that, a bit like one of the recent projects in Embra, shorter sections will be closed off for shorter intervals over the whole time-span; ie a 1 mile stretch could be closed off with diversions for 1 month, then they move on to the next section with different diversions and so on until approx July 22, when all is opened up again. Not necessarily always doing adjacent sections, as they may need to slot in with other road, path, canal, bridge etc work.
My interpretation is that, a bit like one of the recent projects in Embra, shorter sections will be closed off for shorter intervals over the whole time-span; ie a 1 mile stretch could be closed off with diversions for 1 month, then they move on to the next section with different diversions and so on until approx July 22, when all is opened up again. Not necessarily always doing adjacent sections, as they may need to slot in with other road, path, canal, bridge etc work.