There is a very substantial volume of material which has been collected as part of the Motorway Archive exercise. Only a very small proportion of this appears either in the printed volumes or on the website. All of the material will, however, be stored in Record Offices, together with a catalogue of what has been deposited. This catalogue will appear on the website, and this page guides the user to the location of both the material and the catalogue.
It is expected that the bulk of the material will be stored with the Institution of Civil Engineers. Details will appear here in due course.
The material is all stored at the Transport Research Laboratory (TRL). Details, and access to the catalogue, can be found by clicking here.
| Region | Record Office | Deposited? | Catalogued? |
| Scotland | |||
| Northern Ireland | |||
| North West | Cumbria: Carlisle and Kendal | Yes | Yes |
| Lancashire: Preston | Yes | Yes | |
| Cheshire: Chester | Yes | Yes | |
| North East | Wakefield | Yes | No |
| Wales | Cardiff | Yes | Yes |
| Midlands | Northamptonshire | Yes | Yes |
| East | Northamptonshire | Yes | Yes |
| South West | Taunton | Yes | Yes |
| London | |||
| South East | Surrey History Centre | Yes | Yes |
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