Crashes on the A4140

1,117 recorded collisions since 2000.

Since 2000 the A4140 has seen 1,117 collisions, 9 of them fatal and 157 serious. That ranks it 442nd of 6,754 numbered A, B and M roads by total recorded collisions. Its fatal rate is 8.1 per 1,000 collisions, and 15% caused death or serious injury. Collisions have fallen by about 58% since 2000, from 57 to 24 in 2024. The heaviest local concentrations are in Harrow, Brent and Hertsmere.

Figures cover collisions reported to police (STATS19) from 2000 onward. Source: DfT STATS19, Open Government Licence v3.0.