I have been looking at the coverage of maxspeed limit data for
highways in the UK and we seem to have a right mix of styles.
Here is the data for bug chunk of England while avoiding including
anything from France or Ireland (which would include km/hour figure).
We current have over 17,000 highway ways tagged with maxspeed and also
300 ways tagged as 'maxspeed:mph'. You will notice that for 30 miles
per hour we have 30, 30mph, 30 mph, 48.2, 48.28, 48.280, 48.27808,
48.28032 and 48.28.
Any suggestion on what we should recommend for the UK? I guess the USA
should also be party to this discussion but they have far less
population of the maxspeed field (only 70 uses in the Bay area) so
possibly we should come to a view first. Our options seem to be:-
maxspeed=30mph (the user should strip a trailing mph to find the value)
maxspeed=30 (leaving it for the user to realise that it is in the UK
and therefore imperial)
maxspeed=30 mph (the user should strip the last word if it is mph
including the space)
maxspeed:mph=30 (Easy for the user)
maxspeed=48.28 (with a defined precision) For metric use no work by
the user, for imperial use a look-up table is required or a conversion
and rounding
Here is what we have at the moment for 'Mid England' including London,
Portsmouth, Bristol, B'ham up to Liverpool, Manchester and Leeds etc)
starting with the most popular:-
30mph 5185
48.0000000 4155
20mph 1282
64.0000000 922
32.0000000 871
40mph 833
96.0000000 383
30.0000000 341
80.0000000 300
112.0000000 294
30 mph 263
60mph 245
50mph 244
50.0000000 164
20 mph 160
48.2803200 144
48.2800000 97
40 mph 95
48.2780800 75
24.0000000 69
64.3700000 67
16.0000000 67
60.0000000 60
113.0000000 58
40.0000000 54
100.0000000 43
8.0000000 41
50 mph 40
97.0000000 39
national 35
80.4672000 32
20.0000000 31
64.3737600 29
70mph 27
10 mph 23
5mph 20
10.0000000 20
10mph 18
70 mph 18
5 mph 15
15mph 14
110.0000000 11
80.5000000 11
32.1800000 10
nsl 9
36.0000000 9
60 mph 8
45.0000000 6
15.0000000 6
NSL 6
32.1868800 6
19.0000000 5
7.0000000 5
64.4000000 4
11.2000000 3
42.0000000 3
15 mph 3
5.0000000 3
48.2800000 3
12.8000000 2
70.0000000 2
96.5606400 2
160.0000000 2
30mph..change me! 1
80; 50mph; 80 1
32.1870000 1
Carr Lane 1
112.6540800 1
38.0000000 1
48;96 1
32.2000000 1
48;64;80 1
8.0500000 1
54.4000000 1
48.3000000 1
48.2000000 1
16.0900000 1
12.0000000 1
Regards,
Peter
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