All dimensions are in millimetres unless otherwise specified
| Code | WW1R |
|---|---|
| Rule | W13-1 |
| MoTSaM | PW-43 |
| EPS image | Road width or height road narrows right side |
| Non-labeled image | Road width or height road narrows right side |
| Last updated | 8 December 2016 |
| r | 50 | 50 | 60 |
| f | 10 | 10 | 10 |
| e | 15 | 20 | 25 |
| d | 150 | 188 | 225 |
| c | 15 | 19 | 23 |
| b | 60 | 75 | 90 |
| a | 600 | 750 | 900 |
| Border | black |
| Background | reflectorised yellow |
| Symbol | black |
