Euro 6 engines only allowed in Greater Manchester from next May

[knutstransport]

RE: Euro 6 engines only allowed in Greater Manchester from next May

(23/06/2021 08:30)L544 Wrote:  Will the restriction cover long distance coach services and private hires on M6 as J24 to J27 is in Greater Manchester

I've not heard about any exception if the vehicle is just passing through Greater Manchester. How would you distinguish between a Leger coach which leaves the Motorway, goes in to a town to pick up passengers and then rejoins the motorway and a National Express one which remains on the motorway, possibly stopping for a comfort break at a service station on the way?