| Provision authorising acquisition | Initial stage | Subsequent stage |
|---|
| Section 239(1) | The construction of a highway. | The improvement of that highway. |
| Section 239(2)(a) | The carrying out of works authorised by an order relating to a trunk road under section 14 of this Act. | The improvement or alteration of a highway or proposed highway to which the order relates. |
| Section 239(2)(b) | The provision of a maintenance compound for a trunk road. | The extension of the maintenance compound. |
| Section 239(3) | The improvement of a highway. | The further improvement of that highway. |
| Section 239(4)(a) | The improvement of a highway included in the route of a special road. | The further improvement of the highway. |
| Section 239(4)(b) | The purposes of an order made in relation to a special road under section 18 of this Act. | The improvement or alteration of a highway or proposed highway to which the order relates. |
| Section 239(4)(c) | The provision of a service area or maintenance compound for a special road. | The extension of the service area or maintenance compound. |
| Section 240(1) | The carrying out of works authorised by an order relating to a classified road under section 14 of this Act. | The improvement or alteration of a highway or proposed highway to which the order relates. |
| Section 240(3) | The provision of a trunk road picnic area. | The extension of the trunk road picnic area. |
| Section 240(5) | The provision of a lorry area. | The extension of the lorry area. |