Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Fri 2 Jan 2004 | Powys | 1 | 1 | Slight |
| Fri 2 Jan 2004 | Powys | 1 | 1 | Serious |
| Mon 5 Jan 2004 | Ceredigion | 2 | 1 | Slight |
| Mon 5 Jan 2004 | Ceredigion | 1 | 1 | Slight |
| Wed 7 Jan 2004 | Ceredigion | 3 | 2 | Serious |
| Sat 10 Jan 2004 | Powys | 1 | 1 | Slight |
| Wed 14 Jan 2004 | Ceredigion | 2 | 4 | Slight |
| Wed 14 Jan 2004 | Ceredigion | 2 | 2 | Serious |
| Fri 16 Jan 2004 | Pembrokeshire | 1 | 1 | Slight |
| Sat 24 Jan 2004 | Ceredigion | 2 | 3 | Slight |
| Tue 27 Jan 2004 | Gwynedd | 2 | 1 | Slight |
| Fri 30 Jan 2004 | Ceredigion | 2 | 1 | Slight |
| Sat 31 Jan 2004 | Gwynedd | 3 | 1 | Slight |
| Tue 3 Feb 2004 | Ceredigion | 2 | 1 | Slight |
| Thu 5 Feb 2004 | Gwynedd | 1 | 1 | Serious |
| Tue 10 Feb 2004 | Ceredigion | 3 | 1 | Slight |
| Tue 10 Feb 2004 | Ceredigion | 2 | 1 | Slight |
| Wed 11 Feb 2004 | Pembrokeshire | 1 | 1 | Slight |
| Thu 12 Feb 2004 | Ceredigion | 2 | 2 | Slight |
| Fri 13 Feb 2004 | Ceredigion | 3 | 2 | Slight |
| Wed 18 Feb 2004 | Ceredigion | 2 | 1 | Serious |
| Wed 18 Feb 2004 | Ceredigion | 3 | 1 | Slight |
| Wed 18 Feb 2004 | Gwynedd | 1 | 1 | Slight |
| Mon 23 Feb 2004 | Pembrokeshire | 2 | 1 | Slight |
| Thu 26 Feb 2004 | Gwynedd | 3 | 2 | Slight |
| Fri 27 Feb 2004 | Pembrokeshire | 2 | 4 | Slight |
| Sun 29 Feb 2004 | Ceredigion | 1 | 1 | Slight |
| Sun 29 Feb 2004 | Gwynedd | 3 | 1 | Slight |
| Sun 29 Feb 2004 | Gwynedd | 2 | 4 | Slight |
| Mon 1 Mar 2004 | Ceredigion | 3 | 1 | Slight |
| Wed 3 Mar 2004 | Pembrokeshire | 2 | 2 | Slight |
| Sun 7 Mar 2004 | Ceredigion | 2 | 2 | Slight |
| Wed 10 Mar 2004 | Ceredigion | 2 | 1 | Slight |
| Fri 12 Mar 2004 | Pembrokeshire | 2 | 2 | Slight |
| Sat 13 Mar 2004 | Ceredigion | 3 | 1 | Slight |
| Mon 15 Mar 2004 | Ceredigion | 1 | 1 | Slight |
| Tue 16 Mar 2004 | Ceredigion | 3 | 1 | Slight |
| Fri 19 Mar 2004 | Carmarthenshire | 2 | 1 | Slight |
| Sun 21 Mar 2004 | Pembrokeshire | 1 | 1 | Slight |
| Tue 23 Mar 2004 | Ceredigion | 3 | 1 | Slight |
| Thu 25 Mar 2004 | Gwynedd | 1 | 1 | Slight |
| Fri 26 Mar 2004 | Gwynedd | 1 | 1 | Slight |
| Thu 1 Apr 2004 | Ceredigion | 3 | 1 | Slight |
| Thu 1 Apr 2004 | Gwynedd | 1 | 1 | Slight |
| Fri 2 Apr 2004 | Gwynedd | 2 | 1 | Slight |
| Sat 3 Apr 2004 | Gwynedd | 3 | 1 | Slight |
| Sun 4 Apr 2004 | Gwynedd | 2 | 1 | Slight |
| Sun 11 Apr 2004 | Ceredigion | 2 | 1 | Serious |
| Mon 12 Apr 2004 | Ceredigion | 1 | 2 | Slight |
| Fri 16 Apr 2004 | Ceredigion | 2 | 2 | Slight |
| Fri 16 Apr 2004 | Pembrokeshire | 2 | 1 | Slight |
| Sat 17 Apr 2004 | Ceredigion | 2 | 1 | Slight |
| Sat 17 Apr 2004 | Ceredigion | 1 | 1 | Slight |
| Sun 18 Apr 2004 | Gwynedd | 1 | 1 | Slight |
| Thu 22 Apr 2004 | Gwynedd | 2 | 2 | Slight |
| Thu 22 Apr 2004 | Gwynedd | 1 | 2 | Serious |
| Wed 28 Apr 2004 | Gwynedd | 1 | 1 | Slight |
| Sun 2 May 2004 | Ceredigion | 3 | 2 | Slight |
| Sun 2 May 2004 | Gwynedd | 2 | 4 | Slight |
| Sun 2 May 2004 | Ceredigion | 2 | 1 | Slight |
| Tue 4 May 2004 | Ceredigion | 2 | 1 | Slight |
| Tue 11 May 2004 | Ceredigion | 3 | 3 | Slight |
| Fri 14 May 2004 | Ceredigion | 2 | 1 | Slight |
| Sat 15 May 2004 | Powys | 3 | 2 | Slight |
| Sat 15 May 2004 | Ceredigion | 2 | 1 | Slight |
| Sun 16 May 2004 | Gwynedd | 1 | 1 | Slight |
| Tue 18 May 2004 | Pembrokeshire | 2 | 1 | Slight |
| Fri 21 May 2004 | Ceredigion | 4 | 2 | Slight |
| Fri 21 May 2004 | Gwynedd | 2 | 3 | Fatal |
| Sun 23 May 2004 | Ceredigion | 2 | 1 | Slight |
| Mon 24 May 2004 | Ceredigion | 2 | 2 | Slight |
| Tue 25 May 2004 | Ceredigion | 3 | 1 | Slight |
| Fri 28 May 2004 | Pembrokeshire | 2 | 1 | Slight |
| Sat 29 May 2004 | Ceredigion | 2 | 2 | Slight |
| Sat 29 May 2004 | Pembrokeshire | 1 | 1 | Slight |
| Sun 30 May 2004 | Gwynedd | 2 | 2 | Slight |
| Tue 1 Jun 2004 | Powys | 2 | 1 | Slight |
| Wed 2 Jun 2004 | Pembrokeshire | 2 | 1 | Slight |
| Thu 3 Jun 2004 | Ceredigion | 2 | 1 | Slight |
| Fri 4 Jun 2004 | Ceredigion | 3 | 1 | Slight |
| Sat 5 Jun 2004 | Ceredigion | 2 | 2 | Slight |
| Tue 8 Jun 2004 | Ceredigion | 2 | 1 | Slight |
| Thu 10 Jun 2004 | Ceredigion | 2 | 1 | Slight |
| Fri 18 Jun 2004 | Ceredigion | 2 | 1 | Slight |
| Fri 18 Jun 2004 | Gwynedd | 1 | 1 | Serious |
| Sat 19 Jun 2004 | Ceredigion | 2 | 1 | Serious |
| Sun 20 Jun 2004 | Pembrokeshire | 3 | 3 | Serious |
| Mon 21 Jun 2004 | Gwynedd | 2 | 2 | Slight |
| Mon 21 Jun 2004 | Gwynedd | 3 | 5 | Slight |
| Wed 23 Jun 2004 | Gwynedd | 5 | 3 | Slight |
| Wed 23 Jun 2004 | Ceredigion | 2 | 1 | Slight |
| Fri 25 Jun 2004 | Gwynedd | 4 | 3 | Slight |
| Fri 25 Jun 2004 | Ceredigion | 1 | 1 | Serious |
| Sat 26 Jun 2004 | Gwynedd | 2 | 2 | Slight |
| Sun 4 Jul 2004 | Ceredigion | 1 | 2 | Slight |
| Mon 5 Jul 2004 | Ceredigion | 3 | 3 | Serious |
| Mon 5 Jul 2004 | Pembrokeshire | 2 | 1 | Slight |
| Thu 8 Jul 2004 | Ceredigion | 2 | 1 | Slight |
| Fri 9 Jul 2004 | Ceredigion | 2 | 1 | Slight |
| Tue 13 Jul 2004 | Gwynedd | 3 | 1 | Slight |
| Sat 17 Jul 2004 | Ceredigion | 2 | 2 | Serious |
| Sat 17 Jul 2004 | Powys | 2 | 3 | Slight |
| Sat 17 Jul 2004 | Ceredigion | 1 | 1 | Slight |
| Sat 17 Jul 2004 | Ceredigion | 5 | 7 | Slight |
| Sun 18 Jul 2004 | Pembrokeshire | 1 | 2 | Slight |
| Thu 22 Jul 2004 | Ceredigion | 1 | 1 | Slight |
| Thu 22 Jul 2004 | Gwynedd | 2 | 1 | Slight |
| Thu 22 Jul 2004 | Gwynedd | 3 | 2 | Slight |
| Fri 23 Jul 2004 | Ceredigion | 3 | 1 | Slight |
| Tue 27 Jul 2004 | Ceredigion | 2 | 1 | Slight |
| Thu 29 Jul 2004 | Gwynedd | 3 | 1 | Slight |
| Thu 29 Jul 2004 | Ceredigion | 2 | 1 | Slight |
| Mon 2 Aug 2004 | Ceredigion | 2 | 2 | Slight |
| Mon 2 Aug 2004 | Gwynedd | 2 | 1 | Slight |
| Thu 5 Aug 2004 | Ceredigion | 1 | 1 | Slight |
| Sat 7 Aug 2004 | Ceredigion | 1 | 1 | Slight |
| Tue 10 Aug 2004 | Ceredigion | 2 | 2 | Serious |
| Wed 11 Aug 2004 | Pembrokeshire | 3 | 5 | Slight |
| Thu 12 Aug 2004 | Ceredigion | 2 | 1 | Slight |
| Fri 13 Aug 2004 | Pembrokeshire | 1 | 1 | Serious |
| Fri 13 Aug 2004 | Ceredigion | 1 | 1 | Serious |
| Mon 16 Aug 2004 | Ceredigion | 2 | 1 | Serious |
| Mon 16 Aug 2004 | Powys | 1 | 1 | Slight |
| Tue 17 Aug 2004 | Pembrokeshire | 2 | 1 | Slight |
| Tue 17 Aug 2004 | Gwynedd | 1 | 2 | Slight |
| Wed 18 Aug 2004 | Gwynedd | 2 | 1 | Slight |
| Wed 18 Aug 2004 | Gwynedd | 2 | 2 | Slight |
| Wed 18 Aug 2004 | Gwynedd | 1 | 1 | Slight |
| Mon 23 Aug 2004 | Gwynedd | 2 | 2 | Serious |
| Mon 23 Aug 2004 | Gwynedd | 1 | 1 | Slight |
| Wed 25 Aug 2004 | Ceredigion | 2 | 3 | Slight |
| Wed 25 Aug 2004 | Pembrokeshire | 2 | 1 | Serious |
| Fri 27 Aug 2004 | Gwynedd | 2 | 1 | Slight |
| Fri 27 Aug 2004 | Gwynedd | 3 | 2 | Serious |
| Fri 27 Aug 2004 | Pembrokeshire | 1 | 1 | Slight |
| Sat 28 Aug 2004 | Gwynedd | 1 | 1 | Slight |
| Mon 30 Aug 2004 | Pembrokeshire | 2 | 1 | Slight |
| Mon 30 Aug 2004 | Gwynedd | 4 | 2 | Slight |
| Mon 6 Sep 2004 | Gwynedd | 3 | 1 | Slight |
| Thu 9 Sep 2004 | Gwynedd | 2 | 2 | Slight |
| Sat 11 Sep 2004 | Pembrokeshire | 2 | 1 | Slight |
| Mon 13 Sep 2004 | Pembrokeshire | 2 | 2 | Slight |
| Wed 15 Sep 2004 | Gwynedd | 2 | 1 | Slight |
| Fri 17 Sep 2004 | Pembrokeshire | 1 | 1 | Slight |
| Wed 22 Sep 2004 | Ceredigion | 2 | 1 | Slight |
| Thu 23 Sep 2004 | Gwynedd | 1 | 1 | Slight |
| Tue 28 Sep 2004 | Pembrokeshire | 1 | 1 | Serious |
| Wed 29 Sep 2004 | Ceredigion | 2 | 1 | Slight |
| Thu 7 Oct 2004 | Powys | 1 | 1 | Slight |
| Sat 9 Oct 2004 | Gwynedd | 2 | 1 | Slight |
| Sun 10 Oct 2004 | Pembrokeshire | 1 | 2 | Slight |
| Sun 10 Oct 2004 | Gwynedd | 1 | 1 | Serious |
| Sun 10 Oct 2004 | Gwynedd | 1 | 1 | Slight |
| Mon 11 Oct 2004 | Ceredigion | 2 | 1 | Slight |
| Mon 11 Oct 2004 | Gwynedd | 2 | 3 | Serious |
| Thu 14 Oct 2004 | Ceredigion | 2 | 1 | Slight |
| Thu 14 Oct 2004 | Ceredigion | 2 | 2 | Serious |
| Fri 15 Oct 2004 | Ceredigion | 1 | 1 | Slight |
| Fri 15 Oct 2004 | Ceredigion | 3 | 2 | Serious |
| Tue 19 Oct 2004 | Ceredigion | 2 | 2 | Serious |
| Tue 19 Oct 2004 | Ceredigion | 1 | 1 | Slight |
| Fri 22 Oct 2004 | Pembrokeshire | 2 | 2 | Slight |
| Fri 22 Oct 2004 | Pembrokeshire | 1 | 2 | Slight |
| Tue 26 Oct 2004 | Pembrokeshire | 2 | 1 | Slight |
| Tue 26 Oct 2004 | Gwynedd | 1 | 1 | Slight |
| Wed 27 Oct 2004 | Ceredigion | 2 | 2 | Slight |
| Wed 27 Oct 2004 | Ceredigion | 2 | 2 | Slight |
| Fri 29 Oct 2004 | Gwynedd | 2 | 1 | Slight |
| Sat 30 Oct 2004 | Gwynedd | 2 | 2 | Slight |
| Sat 30 Oct 2004 | Gwynedd | 1 | 1 | Slight |
| Fri 5 Nov 2004 | Ceredigion | 2 | 1 | Slight |
| Tue 9 Nov 2004 | Pembrokeshire | 2 | 1 | Slight |
| Wed 10 Nov 2004 | Ceredigion | 2 | 1 | Slight |
| Fri 12 Nov 2004 | Gwynedd | 2 | 1 | Slight |
| Tue 16 Nov 2004 | Ceredigion | 2 | 1 | Slight |
| Wed 17 Nov 2004 | Ceredigion | 2 | 2 | Slight |
| Mon 22 Nov 2004 | Gwynedd | 3 | 1 | Slight |
| Tue 23 Nov 2004 | Pembrokeshire | 2 | 1 | Slight |
| Thu 25 Nov 2004 | Ceredigion | 3 | 3 | Slight |
| Thu 25 Nov 2004 | Ceredigion | 2 | 2 | Serious |
| Sun 28 Nov 2004 | Pembrokeshire | 1 | 1 | Serious |
| Tue 30 Nov 2004 | Ceredigion | 2 | 1 | Serious |
| Wed 1 Dec 2004 | Pembrokeshire | 3 | 1 | Slight |
| Thu 2 Dec 2004 | Ceredigion | 1 | 2 | Slight |
| Thu 2 Dec 2004 | Ceredigion | 2 | 1 | Serious |
| Fri 3 Dec 2004 | Ceredigion | 3 | 1 | Slight |
| Thu 9 Dec 2004 | Ceredigion | 2 | 1 | Slight |
| Fri 10 Dec 2004 | Gwynedd | 4 | 2 | Slight |
| Wed 15 Dec 2004 | Ceredigion | 2 | 2 | Slight |
| Fri 17 Dec 2004 | Ceredigion | 1 | 1 | Slight |
| Mon 20 Dec 2004 | Ceredigion | 2 | 2 | Serious |
| Mon 20 Dec 2004 | Gwynedd | 2 | 1 | Slight |
| Sat 25 Dec 2004 | Gwynedd | 1 | 1 | Slight |
| Wed 29 Dec 2004 | Ceredigion | 2 | 3 | Slight |
| Fri 31 Dec 2004 | Pembrokeshire | 2 | 2 | Slight |