Calibration Certificates (northwestbound)
| Offence Date | Certificate Number | Certificate |
| 12/05/2025 - 11/05/2027 | CRT7786 | AS_Groby_NW_2025 |
| 03/07/2024 - 11/05/2025 | CRT7123 | AS_Groby_NW_2024_2 |
| 12/02/2024 - 02/07/2026 | CRT6897 | AS_Groby_NW_2024 |
Calibration Certificates (southeastbound)
| Offence Date | Certificate Number | Certificate |
| 12/05/2025 - 11/05/2027 | CRT7786 | AS_Groby_SE_2025 |
| 16/05/2023 - 11/05/2025 | CRT6463 | AS_Groby_SE_2023 |