There ISN'T a hard shoulder on the East Lancs Road, and the pinch points I'm refering to are the world's thickest placement of traffic lights between the M61 and A6 on the A580 through Salford. There isn't any space either side at the junctions thanks to them being D3+1AP spec, unless you want to steal the footpaths, or a lane from traffic.
And for several parts near the M60, you're up to everyone's front door...!
For the amount of housing you'd need to clear to keep D3 and add a guided or non-guided bus lane, ie. widening the A580 to the same size as D4AP-NHS standardm you'd need to clear about 80 private homes, or remove all of their access, if you're going to start demolishing housing, why not demolish the housing on the route from Paitcroft to Walkden and re-instate the Leigh railway line through that way?
Or you could not inconvenice any housing, not have to upgrade any A580 (as part of this project), not need any special buses, not have a busway that can't be used by normal traffic, and not have any of this hassle, by simply re-building the line into Leigh, get the Town Centre penitration by running it into the opersite side of the shopping centre car park to the bus station (possibly moving the bus station to this side too, or add multi storey car park to compensate), and knit it into the Atherton Loop at Walkden, tight but do-able curve, and if TfGM is fronting the money for it, they can pay for it to be built and lease maintenance out to Network Rail (in a similar way to the likes of the East London Line) they could also pick up their pocket a bit more and wire the route to Walkden and Leigh, meaning electric traction on the route. But the bill of £170mil for the busway, and £190mil for the railway as I discribed, the're both very expensive projects, but why not spend the extra £20mil and do it properly?
If you want the 'cheap' option, it's putting a station ON the Chat Moss and stopping all the stoppers there (2tph Liverpool, 2tph Wigan), on their way into Victoria, would be a much higher service level than any branch, and would not only serve Leigh and Atherton (by extending the 582 bus service, and some others, 582 diverted to Bolton Interchange and branded as 'Rail Link') it would also serve as a stupidly large Park and Ride for passengers into Wigan, Liverpool and Manchester, is nicely signed off the M6 via Lowton or the East Lancs as a P&R with free parking. Just look at how well Horwich Parkway does with 3tph, this would be similar journey times, and layout, but serve most of North Cheshire, Wigan and the M6, and cost a fraction of either of the other projects, I'm working on about £50mil to build the station, car park, and extend the A579 via this station to the A49 junction on the M6 as a S2WAP standard route, also providing a Lowton Bypass.