Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Wed 12 Jan 2011 | Hertsmere | 2 | 1 | Slight |
| Wed 12 Jan 2011 | Barnet | 1 | 1 | Serious |
| Wed 12 Jan 2011 | Barnet | 2 | 2 | Slight |
| Mon 17 Jan 2011 | Hertsmere | 3 | 1 | Slight |
| Tue 25 Jan 2011 | Barnet | 1 | 1 | Serious |
| Wed 26 Jan 2011 | Watford | 1 | 1 | Slight |
| Thu 27 Jan 2011 | Hertsmere | 2 | 1 | Slight |
| Fri 28 Jan 2011 | Hertsmere | 1 | 1 | Slight |
| Mon 31 Jan 2011 | Hertsmere | 2 | 1 | Slight |
| Sat 5 Feb 2011 | Hertsmere | 2 | 1 | Slight |
| Mon 7 Feb 2011 | Hertsmere | 2 | 1 | Slight |
| Wed 9 Feb 2011 | Hertsmere | 3 | 1 | Slight |
| Fri 11 Feb 2011 | Watford | 2 | 1 | Slight |
| Fri 11 Feb 2011 | Watford | 2 | 1 | Slight |
| Fri 11 Feb 2011 | Hertsmere | 2 | 1 | Slight |
| Sat 12 Feb 2011 | Three Rivers | 2 | 2 | Slight |
| Tue 15 Feb 2011 | Barnet | 2 | 1 | Slight |
| Tue 15 Feb 2011 | Barnet | 2 | 1 | Slight |
| Thu 24 Feb 2011 | Watford | 3 | 2 | Slight |
| Sat 26 Feb 2011 | Hertsmere | 2 | 3 | Slight |
| Sun 27 Feb 2011 | Hertsmere | 3 | 2 | Slight |
| Wed 2 Mar 2011 | Watford | 2 | 1 | Slight |
| Thu 3 Mar 2011 | Watford | 2 | 1 | Slight |
| Mon 7 Mar 2011 | Barnet | 2 | 1 | Slight |
| Wed 9 Mar 2011 | Hertsmere | 1 | 2 | Serious |
| Mon 14 Mar 2011 | Barnet | 2 | 1 | Slight |
| Mon 14 Mar 2011 | Barnet | 3 | 1 | Slight |
| Tue 15 Mar 2011 | Hertsmere | 2 | 1 | Slight |
| Tue 15 Mar 2011 | Watford | 2 | 1 | Slight |
| Tue 15 Mar 2011 | Barnet | 2 | 1 | Slight |
| Fri 25 Mar 2011 | Barnet | 2 | 3 | Slight |
| Tue 5 Apr 2011 | Hertsmere | 1 | 1 | Serious |
| Tue 12 Apr 2011 | Watford | 2 | 1 | Slight |
| Tue 12 Apr 2011 | Watford | 2 | 1 | Slight |
| Fri 15 Apr 2011 | Watford | 6 | 4 | Serious |
| Tue 26 Apr 2011 | Hertsmere | 2 | 3 | Serious |
| Tue 26 Apr 2011 | Watford | 1 | 1 | Slight |
| Tue 3 May 2011 | Barnet | 1 | 1 | Serious |
| Fri 6 May 2011 | Watford | 2 | 1 | Slight |
| Sun 8 May 2011 | Barnet | 2 | 1 | Slight |
| Thu 12 May 2011 | Barnet | 1 | 1 | Serious |
| Thu 12 May 2011 | Hertsmere | 3 | 1 | Slight |
| Thu 26 May 2011 | Watford | 2 | 1 | Slight |
| Thu 9 Jun 2011 | Barnet | 2 | 1 | Slight |
| Sun 12 Jun 2011 | Hertsmere | 2 | 2 | Slight |
| Mon 13 Jun 2011 | Hertsmere | 1 | 1 | Serious |
| Thu 23 Jun 2011 | Watford | 1 | 1 | Serious |
| Sun 3 Jul 2011 | Barnet | 2 | 1 | Slight |
| Mon 4 Jul 2011 | Watford | 1 | 1 | Slight |
| Tue 5 Jul 2011 | Hertsmere | 2 | 2 | Slight |
| Thu 7 Jul 2011 | Watford | 2 | 1 | Slight |
| Thu 7 Jul 2011 | Watford | 2 | 1 | Slight |
| Fri 8 Jul 2011 | Barnet | 2 | 1 | Slight |
| Sat 9 Jul 2011 | Barnet | 2 | 2 | Serious |
| Sun 10 Jul 2011 | Barnet | 1 | 1 | Fatal |
| Thu 14 Jul 2011 | Barnet | 2 | 1 | Slight |
| Thu 21 Jul 2011 | Hertsmere | 1 | 1 | Slight |
| Mon 25 Jul 2011 | Watford | 2 | 2 | Slight |
| Tue 2 Aug 2011 | Barnet | 2 | 1 | Slight |
| Wed 3 Aug 2011 | Watford | 1 | 1 | Slight |
| Wed 3 Aug 2011 | Watford | 1 | 1 | Slight |
| Wed 10 Aug 2011 | Watford | 2 | 2 | Slight |
| Wed 10 Aug 2011 | Watford | 2 | 1 | Slight |
| Fri 12 Aug 2011 | Watford | 2 | 1 | Slight |
| Mon 15 Aug 2011 | Hertsmere | 2 | 1 | Slight |
| Mon 15 Aug 2011 | Watford | 2 | 1 | Slight |
| Fri 26 Aug 2011 | Hertsmere | 4 | 2 | Slight |
| Sun 28 Aug 2011 | Hertsmere | 1 | 2 | Slight |
| Sun 28 Aug 2011 | Watford | 2 | 1 | Slight |
| Sun 28 Aug 2011 | Watford | 2 | 1 | Slight |
| Fri 9 Sep 2011 | Hertsmere | 3 | 1 | Slight |
| Fri 9 Sep 2011 | Watford | 2 | 1 | Serious |
| Sat 10 Sep 2011 | Watford | 1 | 1 | Serious |
| Thu 15 Sep 2011 | Barnet | 2 | 1 | Slight |
| Sat 17 Sep 2011 | Hertsmere | 2 | 2 | Serious |
| Tue 20 Sep 2011 | Watford | 2 | 2 | Slight |
| Wed 21 Sep 2011 | Barnet | 2 | 2 | Slight |
| Thu 22 Sep 2011 | Watford | 2 | 1 | Slight |
| Thu 29 Sep 2011 | Watford | 1 | 1 | Slight |
| Fri 30 Sep 2011 | Hertsmere | 1 | 1 | Serious |
| Sun 2 Oct 2011 | Barnet | 2 | 1 | Slight |
| Mon 3 Oct 2011 | Watford | 2 | 1 | Slight |
| Sat 8 Oct 2011 | Watford | 2 | 2 | Slight |
| Thu 13 Oct 2011 | Barnet | 3 | 1 | Slight |
| Thu 13 Oct 2011 | Barnet | 3 | 1 | Slight |
| Fri 14 Oct 2011 | Watford | 2 | 1 | Serious |
| Wed 19 Oct 2011 | Hertsmere | 2 | 1 | Slight |
| Fri 21 Oct 2011 | Watford | 1 | 1 | Slight |
| Fri 21 Oct 2011 | Watford | 1 | 1 | Slight |
| Sun 23 Oct 2011 | Hertsmere | 3 | 3 | Serious |
| Wed 26 Oct 2011 | Barnet | 1 | 1 | Slight |
| Mon 31 Oct 2011 | Watford | 2 | 1 | Slight |
| Tue 1 Nov 2011 | Watford | 2 | 1 | Slight |
| Tue 1 Nov 2011 | Watford | 2 | 1 | Slight |
| Fri 4 Nov 2011 | Watford | 3 | 1 | Slight |
| Thu 10 Nov 2011 | Hertsmere | 2 | 2 | Serious |
| Sat 12 Nov 2011 | Watford | 2 | 2 | Slight |
| Sat 12 Nov 2011 | Watford | 3 | 1 | Slight |
| Sat 12 Nov 2011 | Watford | 3 | 1 | Slight |
| Sun 13 Nov 2011 | Barnet | 2 | 1 | Slight |
| Tue 15 Nov 2011 | Watford | 2 | 1 | Slight |
| Fri 25 Nov 2011 | Watford | 1 | 1 | Slight |
| Thu 1 Dec 2011 | Watford | 2 | 1 | Slight |
| Sun 11 Dec 2011 | Hertsmere | 2 | 1 | Slight |
| Sat 17 Dec 2011 | Barnet | 2 | 2 | Slight |
| Mon 19 Dec 2011 | Watford | 2 | 1 | Slight |
| Thu 22 Dec 2011 | Hertsmere | 1 | 1 | Slight |
| Fri 30 Dec 2011 | Watford | 3 | 1 | Slight |