Road
Crashes on the B556
391 recorded collisions since 2000.
391
All crashes
3
Fatal
86
Serious
302
Slight
Since 2000 the B556 has seen 391 collisions, 3 of them fatal and 86 serious. That ranks it 1199th of 6,754 numbered A, B and M roads by total recorded collisions. Its fatal rate is 7.7 per 1,000 collisions, and 23% caused death or serious injury. Collisions have fallen by about 74% since 2000, from 31 to 8 in 2024. The heaviest local concentrations are in Hertsmere, St Albans and Broxbourne.
Worst local authorities on the B556
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Crashes by year
2000–202440200
200020052010201520202024
Figures cover collisions reported to police (STATS19) from 2000 onward. Source: DfT STATS19, Open Government Licence v3.0.