The A4123
The A4123 carries 2.5 times the national average rate of motorcyclist killed-or-seriously-injured casualties, per mile ridden.
Figures for the A4123
Rate
5,370
motorcyclist KSI per billion vehicle miles, over 0.003bn miles ridden
95% interval
2,936 to 9,009
national average 2,170
Compared with the national average
2.47x
the whole interval sits above it
Killed or seriously injured
14
2021-2025, of which 1 killed
Exposure
0.003bn
motorcycle vehicle miles ridden on this road over the five years
All casualties
Not published
all-severity total is published only for the headline tables
This finding rests on a small number of casualties: 14 killed or seriously injured over five years, fewer than 20. The true rate could sit anywhere between 2,936 and 9,009 per billion vehicle miles. Read it as a signal, not a settled figure.
Count against rate
Britain's danger rankings usually count casualties, which rewards long, busy roads. The A4123 is 254th by count of 1,710 ranked roads, and 298th by rate — above average once the 0.003 billion miles ridden on it are taken into account. See the full ranking.
The A4123 on the map
The road as mapped, with the motorcycle collisions recorded on it between 2021 and 2025.
Loading map
Cyclists
Method and source
Motorcyclist casualties on this road from DfT STATS19, 2021-2025, divided by motorcycle traffic on the same road from the DfT annual average daily flow counts. KSI means killed or seriously injured. The interval is the 95% confidence interval on the rate; a rate is never shown without the miles it was divided by. We publish a page for a road only where that interval clears the national average of 2,170 KSI per billion vehicle miles, so roads that cannot be told apart from average have no page.
DfT STATS19 casualty and collision files 2021-2025, and DfT AADF traffic counts 2021-2025, both under the Open Government Licence v3.0
Contains public sector information licensed under the Open Government Licence v3.0.