Marker Posts on the A21
Dataset summary for A21 including area, region, and suffix letter breakdowns.
Use the map to explore the live dataset
Filter by road, region and area — then drill into the exact marker post you need.
Total marker posts (A21)
338
Breakdowns included
Area (AREA1–AREA12)
Region (NE/NW/SW…)
Suffix letter (A/J/M/K…)
Area breakdown
Includes numeric range| Area | Count | % | Number range |
|---|---|---|---|
| AREA4 | 338 | 100.0% | 27/4B – 57/1B |
Region breakdown
NE / NW / SW…| Region | Count | % |
|---|---|---|
| SE | 338 | 100.0% |
Regions help you understand coverage and where the dataset is densest.
Suffix letter breakdown
A / J / M / K…| Suffix | Count | % |
|---|---|---|
| B | 175 | 51.78% |
| A | 163 | 48.22% |
Suffix letters are pulled from the end of the marker post number (e.g. 0/1J → J).
Example marker posts
Sample recordsA small sample of marker posts for the A21 dataset:
SE · AREA4 · P27/4A
SE · AREA4 · P27/4B
SE · AREA4 · P27/5A
SE · AREA4 · P27/5B
SE · AREA4 · P27/6A
SE · AREA4 · P27/6B
SE · AREA4 · P27/7B
SE · AREA4 · P27/8B
SE · AREA4 · P27/9A
SE · AREA4 · P27/9B
SE · AREA4 · P28/0A
SE · AREA4 · P28/0B
SE · AREA4 · P28/1A
SE · AREA4 · P28/1B
SE · AREA4 · P28/2A
SE · AREA4 · P28/2B
SE · AREA4 · P28/3A
SE · AREA4 · P28/3B
SE · AREA4 · P28/4A
SE · AREA4 · P28/4B
SE · AREA4 · P28/5A
SE · AREA4 · P28/5B
SE · AREA4 · P28/6A
SE · AREA4 · P28/6B
SE · AREA4 · P28/7A
SE · AREA4 · P28/7B
SE · AREA4 · P28/8A
SE · AREA4 · P28/8B
SE · AREA4 · P28/9A
SE · AREA4 · P28/9B