Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Thu 1 Jan 2004 | Cardiff | 2 | 1 | Slight |
| Sat 3 Jan 2004 | Cardiff | 2 | 1 | Slight |
| Mon 19 Jan 2004 | Cardiff | 2 | 2 | Slight |
| Thu 22 Jan 2004 | The Vale of Glamorgan | 2 | 1 | Slight |
| Sat 31 Jan 2004 | Cardiff | 2 | 3 | Slight |
| Fri 6 Feb 2004 | Cardiff | 2 | 1 | Slight |
| Sun 15 Feb 2004 | Cardiff | 1 | 1 | Slight |
| Sun 15 Feb 2004 | Cardiff | 2 | 1 | Slight |
| Thu 25 Mar 2004 | Cardiff | 2 | 3 | Slight |
| Sat 10 Apr 2004 | Cardiff | 1 | 1 | Serious |
| Wed 14 Apr 2004 | The Vale of Glamorgan | 3 | 1 | Slight |
| Mon 19 Apr 2004 | Cardiff | 2 | 1 | Slight |
| Sat 24 Apr 2004 | Cardiff | 2 | 2 | Slight |
| Thu 3 Jun 2004 | Cardiff | 3 | 1 | Slight |
| Mon 7 Jun 2004 | Cardiff | 2 | 2 | Slight |
| Sun 4 Jul 2004 | Cardiff | 1 | 1 | Slight |
| Thu 8 Jul 2004 | The Vale of Glamorgan | 2 | 1 | Slight |
| Fri 30 Jul 2004 | The Vale of Glamorgan | 2 | 1 | Slight |
| Sat 14 Aug 2004 | Cardiff | 1 | 4 | Fatal |
| Thu 19 Aug 2004 | Cardiff | 2 | 2 | Slight |
| Mon 23 Aug 2004 | Cardiff | 2 | 1 | Slight |
| Thu 26 Aug 2004 | Cardiff | 2 | 2 | Slight |
| Thu 26 Aug 2004 | Cardiff | 2 | 3 | Slight |
| Fri 3 Sep 2004 | Cardiff | 2 | 1 | Serious |
| Thu 9 Sep 2004 | Cardiff | 2 | 1 | Slight |
| Sat 11 Sep 2004 | Cardiff | 2 | 1 | Slight |
| Mon 13 Sep 2004 | Cardiff | 2 | 2 | Slight |
| Sat 18 Sep 2004 | Cardiff | 2 | 4 | Slight |
| Wed 22 Sep 2004 | Cardiff | 2 | 1 | Slight |
| Tue 28 Sep 2004 | The Vale of Glamorgan | 2 | 2 | Slight |
| Sat 9 Oct 2004 | Cardiff | 2 | 1 | Slight |
| Mon 11 Oct 2004 | Cardiff | 1 | 1 | Slight |
| Wed 13 Oct 2004 | Cardiff | 2 | 2 | Slight |
| Wed 20 Oct 2004 | The Vale of Glamorgan | 2 | 1 | Slight |
| Fri 22 Oct 2004 | Cardiff | 2 | 2 | Slight |
| Tue 26 Oct 2004 | Cardiff | 2 | 1 | Slight |
| Sat 20 Nov 2004 | Cardiff | 1 | 1 | Slight |
| Mon 22 Nov 2004 | Cardiff | 2 | 2 | Slight |
| Fri 3 Dec 2004 | The Vale of Glamorgan | 3 | 1 | Slight |
| Fri 10 Dec 2004 | Cardiff | 2 | 2 | Slight |
| Sat 11 Dec 2004 | Cardiff | 2 | 1 | Serious |
| Tue 14 Dec 2004 | Cardiff | 2 | 5 | Slight |
| Sun 19 Dec 2004 | Cardiff | 2 | 1 | Slight |