Marker Posts on the M4

Dataset summary for M4 including area, region, and suffix letter breakdowns.

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Total marker posts (M4)
7444
Breakdowns included
Area (AREA1–AREA12) Region (NE/NW/SW…) Suffix letter (A/J/M/K…)
Area breakdown
Includes numeric range
Area Count % Number range
null 3467 46.57% 169/5A – 320/6A
AREA3 1855 24.92% 31/5A – 124/2A
AREA2 1447 19.44% 124/2B – 195/7A
AREA5 420 5.64% 12/1A – 31/4A
SEVERN 174 2.34% 195/8A – 204/4A
WALES 80 1.07% 204/5A – 208/4A
HOUNSLOW LB 1 0.01% 12/1B – 12/1B
Region breakdown
NE / NW / SW…
Region Count %
null 3467 46.57%
HE 1995 26.8%
SW 1982 26.63%
Regions help you understand coverage and where the dataset is densest.
Suffix letter breakdown
A / J / M / K…
Suffix Count %
A 3448 46.32%
B 3448 46.32%
M 149 2.0%
J 147 1.97%
L 111 1.49%
K 103 1.38%
? 26 0.35%
E 4 0.05%
C 3 0.04%
G 1 0.01%
H 1 0.01%
N 1 0.01%
S 1 0.01%
W 1 0.01%

Suffix letters are pulled from the end of the marker post number (e.g. 0/1J → J).

Example marker posts
Sample records

A small sample of marker posts for the M4 dataset:

HE · AREA3 · P100/0A HE · AREA3 · P100/0B HE · AREA3 · P100/1A HE · AREA3 · P100/1B HE · AREA3 · P100/2A HE · AREA3 · P100/2B HE · AREA3 · P100/3A HE · AREA3 · P100/3B HE · AREA3 · P100/4A HE · AREA3 · P100/4B HE · AREA3 · P100/5A HE · AREA3 · P100/5B HE · AREA3 · P100/6A HE · AREA3 · P100/6B HE · AREA3 · P100/7A HE · AREA3 · P100/7B HE · AREA3 · P100/8A HE · AREA3 · P100/8B HE · AREA3 · P100/9A HE · AREA3 · P100/9B HE · AREA3 · P101/0A HE · AREA3 · P101/0B HE · AREA3 · P101/1A HE · AREA3 · P101/1B HE · AREA3 · P101/2A HE · AREA3 · P101/2B HE · AREA3 · P101/3A HE · AREA3 · P101/3B HE · AREA3 · P101/4A HE · AREA3 · P101/4B
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