The proposal includes the construction of a bypass for Ardley village so the site will have a direct connection onto M40 J10/A43.
The point is that there's already a huge amount of freight going right past this site, some of which may then transfer to rail for part of its journey. Although there is also a suspicion that the handy road links mean that the rail terminal bit is just there to improve the chance of getting planning permission.
The orginal strategy document envisaged the Ardley passenger station as a later stage option (post 2038) - not sure if this development, if approved, might accelerate that.
My bold.
I'm still intrigued by the logic.
Rail 'intermodal' (= containers) is at its most competitive against road for shipment traffic. Both road and rail have the transhipment costs at the port. The second transhipment, inevitable by rail but not needed by road, increases rail's costs but is balanced by the reduced costs of transit by rail as the distance increases. There will be a distance at which rail and road costs equalise, ie the reduced per mile cost of rail at that distance equals the increased cost of the second transhipment. It's just over 80 miles from Southampton to Ardley, and this in my view would probably below that break-even point. Freightliners soon abandoned the shorter transits. The regular Southampton - Northampton flow is probably very close to the break-even point, but helped by being a distance close to the maximum road driving distance before a break is required.
A second consideration is that the opportunity of road distribution from Ardley northwards is limited by the existence of rail/road terminals not much further North, as I've already mentioned. Lots of container lorries do indeed pass the A43/M40 junction near Ardley, but I think almost all of them that take the A43 & go to the M1. there's not much in the way of traffic objectives just in the next few miles where they might go, before Northampton Gateway or DIRFT become more suitable.
The third point is anecdotal. I drive down the A34 a few times a year and so I am sadly familiar with container lorries on the route, To me, there seems to be a majority of 20' boxes on short trailers which suggests that they are comparatively small volume consignments better suited to road transport throughout anyway. Freightliner has done a good job over the years of getting all thetraffic from Southampton that is suitable for rail. The transhipment costs of a 20' box and a 40' & tall box are the same, so the break-even distance (on the assumption that charges relate to size as well as distance) is greater for the smallest box.
I am not trying to be dogmatic, just puzzling about what market the new terminal is aimed at. Unless, as has been mentioned, it's just an attempt to game the planning rules ...