Blair’s Underpass
| Structure No | 40297 |
| Structure Name | Blair’s Underpass |
| Last PI Date | 22-Aug-2011 |
| Next PI Date +/- 6 Month | 15-Apr-2017 |
| Last GI Date | 20-Feb-2013 |
| Next GI Due +/- 6 Month | 20-Feb-2015 |
| Route | M1 |
| X | 287694 |
| Y | 361461 |
| Spanning | U1020 |
| Orientation | W-E |
| Skew | 5.00 |
| Span Length | 9.20 |
| Structure Type | Underbridge – Single span portal frame structure |
| Joint Type | – |
| Parapet | Metal Painted |
| Construction Year | 1967 |
| HA_Rating | 40 |
| HB_Rating | 45 |