| Site | Type | Grid Ref |
|---|---|---|
| A602 | ||
| Watton at Stone | milestone | TL304191 |
| Knebworth | milestone | TL262212 |
| Broadwater | milestone | TL249219 |
| Stevenage Old Town | milestone | TL233261 |
| Graveley | milestone | TL232277 |
| Jacks Hill | milestone | TL234292 |
| Baldock | milestone | TL245323 |
| A10 | ||
| Mile End Farm | milestone | TL359388 |
| Royston | milestone | TL361418 |
| Holland Hall | milestone | TL368431 |
| B1368 Barkway | ||
| Near Barley | milestone | TL401399 |
| Barley | milestone | TL398383 |
| Barkway | milestone | TL384358 |
| Cave Gate | milestone | TL389326 |
| Silk Mead Farm | milestone | TL392311 |
| Dassles Hill | milestone | TL393280 |
| Braughing | milestone | TL392248 |
| Misc | ||
| Barley | milestone | TL398384 |
| Chalfont St Peter | obelisk | TQ003924 |
| Little Chalfont | milepost | TQ000977 |
| Chenies | milepost | TQ015980 |
| St Paul's Church | milestone | TL081006 |
| Wadesmill | milestone | TL360177 |
| Wadesmill | Toll | TL360176 |
