Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Tue 6 Jan 2004 | North Hertfordshire | 1 | 1 | Slight |
| Tue 6 Jan 2004 | North Hertfordshire | 2 | 1 | Slight |
| Fri 16 Jan 2004 | North Hertfordshire | 2 | 4 | Slight |
| Tue 20 Jan 2004 | North Hertfordshire | 2 | 1 | Slight |
| Tue 20 Jan 2004 | North Hertfordshire | 2 | 1 | Slight |
| Mon 26 Jan 2004 | North Hertfordshire | 2 | 1 | Slight |
| Thu 5 Feb 2004 | North Hertfordshire | 3 | 4 | Slight |
| Wed 31 Mar 2004 | North Hertfordshire | 5 | 2 | Slight |
| Wed 31 Mar 2004 | North Hertfordshire | 3 | 2 | Serious |
| Wed 31 Mar 2004 | North Hertfordshire | 3 | 2 | Serious |
| Tue 20 Apr 2004 | North Hertfordshire | 2 | 1 | Slight |
| Fri 23 Apr 2004 | North Hertfordshire | 2 | 1 | Slight |
| Fri 23 Apr 2004 | North Hertfordshire | 2 | 1 | Slight |
| Sun 30 May 2004 | North Hertfordshire | 2 | 1 | Slight |
| Mon 21 Jun 2004 | North Hertfordshire | 2 | 1 | Slight |
| Mon 21 Jun 2004 | North Hertfordshire | 2 | 1 | Slight |
| Sat 3 Jul 2004 | North Hertfordshire | 1 | 2 | Slight |
| Sat 3 Jul 2004 | North Hertfordshire | 1 | 2 | Slight |
| Sat 31 Jul 2004 | North Hertfordshire | 2 | 3 | Slight |
| Sun 1 Aug 2004 | North Hertfordshire | 2 | 4 | Slight |
| Mon 2 Aug 2004 | North Hertfordshire | 3 | 2 | Slight |
| Mon 2 Aug 2004 | North Hertfordshire | 3 | 2 | Slight |
| Mon 2 Aug 2004 | North Hertfordshire | 3 | 1 | Slight |
| Fri 13 Aug 2004 | North Hertfordshire | 2 | 1 | Slight |
| Fri 8 Oct 2004 | North Hertfordshire | 2 | 2 | Slight |
| Fri 15 Oct 2004 | North Hertfordshire | 2 | 1 | Slight |
| Mon 1 Nov 2004 | North Hertfordshire | 2 | 3 | Serious |
| Mon 8 Nov 2004 | North Hertfordshire | 2 | 1 | Slight |
| Mon 27 Dec 2004 | North Hertfordshire | 1 | 1 | Serious |