Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Sun 4 Jan 2004 | Hertsmere | 2 | 1 | Slight |
| Mon 5 Jan 2004 | St. Albans | 2 | 2 | Slight |
| Mon 19 Jan 2004 | Hertsmere | 3 | 1 | Slight |
| Tue 20 Jan 2004 | St. Albans | 2 | 1 | Slight |
| Fri 23 Jan 2004 | St. Albans | 2 | 1 | Slight |
| Mon 26 Jan 2004 | St. Albans | 2 | 1 | Slight |
| Sat 31 Jan 2004 | Hertsmere | 2 | 1 | Slight |
| Tue 24 Feb 2004 | St. Albans | 2 | 2 | Slight |
| Tue 2 Mar 2004 | St. Albans | 1 | 1 | Slight |
| Tue 2 Mar 2004 | Hertsmere | 1 | 1 | Slight |
| Thu 4 Mar 2004 | St. Albans | 2 | 1 | Slight |
| Sun 7 Mar 2004 | St. Albans | 2 | 1 | Slight |
| Mon 8 Mar 2004 | St. Albans | 2 | 1 | Slight |
| Tue 9 Mar 2004 | Hertsmere | 1 | 1 | Serious |
| Mon 15 Mar 2004 | St. Albans | 3 | 1 | Slight |
| Tue 23 Mar 2004 | Hertsmere | 2 | 2 | Slight |
| Wed 24 Mar 2004 | Hertsmere | 1 | 1 | Serious |
| Fri 26 Mar 2004 | St. Albans | 1 | 1 | Serious |
| Sat 3 Apr 2004 | St. Albans | 2 | 4 | Slight |
| Thu 8 Apr 2004 | St. Albans | 3 | 4 | Slight |
| Sat 17 Apr 2004 | St. Albans | 2 | 2 | Slight |
| Sun 18 Apr 2004 | Hertsmere | 2 | 3 | Serious |
| Thu 22 Apr 2004 | St. Albans | 2 | 1 | Slight |
| Fri 30 Apr 2004 | Hertsmere | 2 | 1 | Slight |
| Fri 30 Apr 2004 | St. Albans | 2 | 4 | Serious |
| Fri 21 May 2004 | St. Albans | 1 | 1 | Slight |
| Fri 21 May 2004 | Hertsmere | 2 | 3 | Slight |
| Mon 31 May 2004 | St. Albans | 2 | 1 | Slight |
| Fri 11 Jun 2004 | Hertsmere | 1 | 1 | Slight |
| Sun 13 Jun 2004 | St. Albans | 2 | 1 | Slight |
| Mon 14 Jun 2004 | Hertsmere | 2 | 1 | Slight |
| Wed 16 Jun 2004 | St. Albans | 2 | 1 | Serious |
| Wed 23 Jun 2004 | St. Albans | 2 | 1 | Slight |
| Thu 1 Jul 2004 | Hertsmere | 1 | 1 | Slight |
| Thu 8 Jul 2004 | St. Albans | 2 | 1 | Slight |
| Sat 17 Jul 2004 | St. Albans | 2 | 1 | Serious |
| Tue 20 Jul 2004 | St. Albans | 2 | 4 | Slight |
| Mon 9 Aug 2004 | Hertsmere | 4 | 2 | Slight |
| Thu 12 Aug 2004 | Hertsmere | 2 | 2 | Slight |
| Thu 12 Aug 2004 | St. Albans | 2 | 1 | Slight |
| Fri 27 Aug 2004 | Hertsmere | 3 | 2 | Serious |
| Sun 29 Aug 2004 | St. Albans | 2 | 1 | Slight |
| Tue 28 Sep 2004 | St. Albans | 1 | 2 | Fatal |
| Wed 29 Sep 2004 | Hertsmere | 1 | 1 | Slight |
| Thu 30 Sep 2004 | Hertsmere | 2 | 1 | Slight |
| Thu 30 Sep 2004 | St. Albans | 2 | 1 | Slight |
| Sat 9 Oct 2004 | St. Albans | 2 | 3 | Slight |
| Fri 15 Oct 2004 | Hertsmere | 2 | 1 | Slight |
| Sat 23 Oct 2004 | Hertsmere | 3 | 3 | Slight |
| Wed 27 Oct 2004 | St. Albans | 2 | 2 | Slight |
| Fri 29 Oct 2004 | St. Albans | 2 | 1 | Slight |
| Sat 6 Nov 2004 | St. Albans | 2 | 1 | Serious |
| Tue 9 Nov 2004 | St. Albans | 2 | 1 | Slight |
| Fri 12 Nov 2004 | Stevenage | 2 | 1 | Slight |
| Sat 20 Nov 2004 | St. Albans | 3 | 1 | Slight |
| Sun 28 Nov 2004 | St. Albans | 3 | 1 | Slight |
| Wed 1 Dec 2004 | St. Albans | 2 | 2 | Slight |
| Mon 6 Dec 2004 | St. Albans | 1 | 1 | Serious |
| Tue 7 Dec 2004 | St. Albans | 2 | 1 | Slight |
| Wed 8 Dec 2004 | St. Albans | 2 | 1 | Slight |
| Sat 11 Dec 2004 | St. Albans | 1 | 1 | Slight |