Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Sun 9 Jan 2011 | Harrow | 1 | 1 | Slight |
| Mon 14 Feb 2011 | Watford | 2 | 1 | Slight |
| Fri 18 Mar 2011 | Harrow | 1 | 1 | Slight |
| Thu 5 May 2011 | Three Rivers | 1 | 2 | Slight |
| Tue 10 May 2011 | Watford | 2 | 1 | Slight |
| Thu 19 May 2011 | Three Rivers | 2 | 1 | Slight |
| Fri 20 May 2011 | Hertsmere | 1 | 1 | Slight |
| Wed 1 Jun 2011 | Harrow | 2 | 4 | Slight |
| Mon 13 Jun 2011 | Hertsmere | 4 | 2 | Slight |
| Wed 29 Jun 2011 | Watford | 1 | 1 | Slight |
| Wed 29 Jun 2011 | Watford | 2 | 1 | Slight |
| Tue 26 Jul 2011 | Hertsmere | 3 | 1 | Slight |
| Wed 3 Aug 2011 | Watford | 2 | 2 | Slight |
| Tue 16 Aug 2011 | Hertsmere | 3 | 5 | Slight |
| Tue 16 Aug 2011 | Hertsmere | 3 | 5 | Slight |
| Sat 3 Sep 2011 | Hertsmere | 3 | 1 | Slight |
| Thu 8 Sep 2011 | Hertsmere | 2 | 1 | Slight |
| Tue 13 Sep 2011 | Harrow | 2 | 1 | Slight |
| Fri 16 Sep 2011 | Hertsmere | 2 | 1 | Serious |
| Fri 16 Sep 2011 | Hertsmere | 2 | 1 | Serious |
| Sat 8 Oct 2011 | Harrow | 2 | 2 | Slight |
| Sun 20 Nov 2011 | Three Rivers | 2 | 2 | Slight |
| Thu 1 Dec 2011 | Watford | 2 | 1 | Slight |
| Thu 1 Dec 2011 | Harrow | 2 | 1 | Slight |
| Sat 3 Dec 2011 | Three Rivers | 1 | 1 | Slight |