Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Fri 2 Jan 1998 | Pembrokeshire | 2 | 1 | Slight |
| Sat 3 Jan 1998 | Ceredigion | 2 | 1 | Slight |
| Wed 7 Jan 1998 | Gwynedd | 1 | 1 | Slight |
| Thu 8 Jan 1998 | Ceredigion | 3 | 3 | Fatal |
| Thu 8 Jan 1998 | Ceredigion | 2 | 2 | Slight |
| Mon 12 Jan 1998 | Pembrokeshire | 1 | 1 | Serious |
| Thu 15 Jan 1998 | Ceredigion | 3 | 1 | Slight |
| Sun 18 Jan 1998 | Gwynedd | 1 | 1 | Slight |
| Tue 20 Jan 1998 | Carmarthenshire | 1 | 1 | Slight |
| Wed 21 Jan 1998 | Ceredigion | 3 | 2 | Fatal |
| Sun 25 Jan 1998 | Gwynedd | 2 | 1 | Slight |
| Wed 28 Jan 1998 | Powys | 2 | 1 | Slight |
| Thu 29 Jan 1998 | Gwynedd | 5 | 1 | Slight |
| Sat 31 Jan 1998 | Gwynedd | 2 | 2 | Slight |
| Wed 4 Feb 1998 | Ceredigion | 4 | 3 | Slight |
| Wed 4 Feb 1998 | Ceredigion | 1 | 1 | Slight |
| Thu 5 Feb 1998 | Ceredigion | 1 | 1 | Slight |
| Sat 7 Feb 1998 | Ceredigion | 2 | 2 | Slight |
| Sat 7 Feb 1998 | Ceredigion | 1 | 2 | Slight |
| Mon 9 Feb 1998 | Ceredigion | 2 | 1 | Slight |
| Tue 10 Feb 1998 | Pembrokeshire | 1 | 1 | Slight |
| Thu 12 Feb 1998 | Ceredigion | 2 | 2 | Slight |
| Sat 14 Feb 1998 | Ceredigion | 1 | 2 | Fatal |
| Thu 19 Feb 1998 | Ceredigion | 2 | 1 | Serious |
| Wed 25 Feb 1998 | Gwynedd | 2 | 1 | Slight |
| Thu 26 Feb 1998 | Gwynedd | 3 | 3 | Serious |
| Thu 26 Feb 1998 | Pembrokeshire | 3 | 1 | Slight |
| Sun 1 Mar 1998 | Gwynedd | 2 | 5 | Slight |
| Mon 2 Mar 1998 | Ceredigion | 2 | 1 | Slight |
| Thu 5 Mar 1998 | Pembrokeshire | 2 | 1 | Slight |
| Fri 6 Mar 1998 | Gwynedd | 3 | 2 | Serious |
| Wed 11 Mar 1998 | Gwynedd | 2 | 1 | Slight |
| Wed 11 Mar 1998 | Ceredigion | 2 | 2 | Slight |
| Wed 18 Mar 1998 | Ceredigion | 2 | 1 | Slight |
| Sat 21 Mar 1998 | Pembrokeshire | 2 | 1 | Slight |
| Tue 24 Mar 1998 | Ceredigion | 1 | 1 | Slight |
| Wed 25 Mar 1998 | Ceredigion | 1 | 1 | Slight |
| Wed 25 Mar 1998 | Ceredigion | 2 | 1 | Slight |
| Wed 1 Apr 1998 | Ceredigion | 2 | 1 | Slight |
| Wed 1 Apr 1998 | Ceredigion | 2 | 1 | Slight |
| Fri 3 Apr 1998 | Gwynedd | 2 | 3 | Slight |
| Wed 8 Apr 1998 | Gwynedd | 2 | 4 | Slight |
| Fri 10 Apr 1998 | Pembrokeshire | 1 | 2 | Serious |
| Fri 10 Apr 1998 | Gwynedd | 1 | 1 | Slight |
| Sat 11 Apr 1998 | Ceredigion | 2 | 2 | Slight |
| Tue 14 Apr 1998 | Ceredigion | 2 | 1 | Slight |
| Tue 14 Apr 1998 | Ceredigion | 1 | 1 | Slight |
| Wed 15 Apr 1998 | Pembrokeshire | 1 | 1 | Serious |
| Thu 16 Apr 1998 | Ceredigion | 1 | 1 | Slight |
| Fri 17 Apr 1998 | Ceredigion | 2 | 1 | Slight |
| Sun 19 Apr 1998 | Gwynedd | 3 | 1 | Slight |
| Tue 21 Apr 1998 | Ceredigion | 2 | 1 | Slight |
| Wed 22 Apr 1998 | Ceredigion | 1 | 1 | Slight |
| Wed 22 Apr 1998 | Gwynedd | 3 | 4 | Slight |
| Sat 25 Apr 1998 | Ceredigion | 2 | 2 | Slight |
| Sun 26 Apr 1998 | Gwynedd | 1 | 1 | Slight |
| Tue 28 Apr 1998 | Ceredigion | 3 | 2 | Slight |
| Wed 29 Apr 1998 | Pembrokeshire | 2 | 1 | Slight |
| Wed 29 Apr 1998 | Gwynedd | 2 | 1 | Slight |
| Fri 1 May 1998 | Ceredigion | 2 | 1 | Slight |
| Sat 2 May 1998 | Ceredigion | 2 | 2 | Slight |
| Mon 4 May 1998 | Ceredigion | 2 | 2 | Slight |
| Wed 6 May 1998 | Ceredigion | 1 | 1 | Slight |
| Fri 8 May 1998 | Ceredigion | 2 | 1 | Slight |
| Fri 8 May 1998 | Pembrokeshire | 3 | 2 | Slight |
| Fri 8 May 1998 | Ceredigion | 2 | 2 | Slight |
| Tue 12 May 1998 | Ceredigion | 2 | 1 | Slight |
| Wed 13 May 1998 | Pembrokeshire | 2 | 1 | Slight |
| Thu 14 May 1998 | Gwynedd | 2 | 1 | Slight |
| Fri 15 May 1998 | Pembrokeshire | 2 | 6 | Serious |
| Sat 16 May 1998 | Gwynedd | 1 | 1 | Slight |
| Sun 17 May 1998 | Ceredigion | 2 | 1 | Slight |
| Mon 18 May 1998 | Pembrokeshire | 2 | 1 | Serious |
| Thu 21 May 1998 | Pembrokeshire | 2 | 1 | Serious |
| Thu 21 May 1998 | Ceredigion | 1 | 1 | Serious |
| Sun 24 May 1998 | Gwynedd | 2 | 1 | Serious |
| Mon 25 May 1998 | Pembrokeshire | 2 | 1 | Fatal |
| Sun 31 May 1998 | Ceredigion | 2 | 3 | Serious |
| Sat 6 Jun 1998 | Gwynedd | 2 | 1 | Slight |
| Sun 7 Jun 1998 | Ceredigion | 2 | 1 | Slight |
| Mon 8 Jun 1998 | Ceredigion | 2 | 1 | Slight |
| Tue 9 Jun 1998 | Ceredigion | 2 | 1 | Slight |
| Sat 13 Jun 1998 | Gwynedd | 1 | 4 | Slight |
| Mon 15 Jun 1998 | Gwynedd | 2 | 1 | Slight |
| Thu 18 Jun 1998 | Gwynedd | 2 | 1 | Slight |
| Thu 18 Jun 1998 | Ceredigion | 2 | 1 | Slight |
| Mon 22 Jun 1998 | Gwynedd | 2 | 1 | Slight |
| Tue 23 Jun 1998 | Ceredigion | 2 | 2 | Slight |
| Tue 23 Jun 1998 | Ceredigion | 3 | 2 | Slight |
| Wed 24 Jun 1998 | Pembrokeshire | 2 | 1 | Slight |
| Thu 25 Jun 1998 | Gwynedd | 2 | 2 | Serious |
| Thu 25 Jun 1998 | Gwynedd | 2 | 2 | Slight |
| Sat 27 Jun 1998 | Gwynedd | 2 | 1 | Slight |
| Sun 28 Jun 1998 | Ceredigion | 1 | 2 | Slight |
| Sun 28 Jun 1998 | Ceredigion | 2 | 3 | Serious |
| Fri 3 Jul 1998 | Ceredigion | 1 | 1 | Serious |
| Tue 7 Jul 1998 | Ceredigion | 2 | 1 | Slight |
| Wed 8 Jul 1998 | Ceredigion | 3 | 1 | Slight |
| Wed 8 Jul 1998 | Gwynedd | 2 | 1 | Slight |
| Thu 9 Jul 1998 | Gwynedd | 1 | 1 | Slight |
| Sat 11 Jul 1998 | Ceredigion | 3 | 1 | Slight |
| Sat 11 Jul 1998 | Gwynedd | 1 | 1 | Serious |
| Sun 12 Jul 1998 | Ceredigion | 2 | 2 | Slight |
| Sun 12 Jul 1998 | Ceredigion | 2 | 2 | Serious |
| Thu 16 Jul 1998 | Gwynedd | 2 | 2 | Slight |
| Fri 17 Jul 1998 | Ceredigion | 2 | 2 | Slight |
| Fri 17 Jul 1998 | Gwynedd | 2 | 2 | Slight |
| Mon 20 Jul 1998 | Powys | 2 | 2 | Slight |
| Thu 23 Jul 1998 | Gwynedd | 2 | 1 | Slight |
| Thu 23 Jul 1998 | Ceredigion | 2 | 3 | Serious |
| Fri 24 Jul 1998 | Ceredigion | 3 | 5 | Serious |
| Sun 26 Jul 1998 | Ceredigion | 1 | 1 | Serious |
| Wed 29 Jul 1998 | Ceredigion | 2 | 2 | Slight |
| Wed 29 Jul 1998 | Ceredigion | 2 | 1 | Slight |
| Thu 30 Jul 1998 | Ceredigion | 2 | 1 | Serious |
| Thu 30 Jul 1998 | Gwynedd | 1 | 1 | Slight |
| Sat 1 Aug 1998 | Ceredigion | 3 | 1 | Slight |
| Mon 3 Aug 1998 | Gwynedd | 3 | 1 | Slight |
| Mon 3 Aug 1998 | Gwynedd | 2 | 4 | Serious |
| Tue 4 Aug 1998 | Ceredigion | 2 | 1 | Serious |
| Thu 6 Aug 1998 | Pembrokeshire | 2 | 1 | Slight |
| Sat 8 Aug 1998 | Gwynedd | 3 | 1 | Slight |
| Mon 10 Aug 1998 | Ceredigion | 4 | 1 | Slight |
| Mon 10 Aug 1998 | Pembrokeshire | 2 | 3 | Slight |
| Tue 11 Aug 1998 | Gwynedd | 1 | 1 | Slight |
| Tue 11 Aug 1998 | Ceredigion | 1 | 1 | Slight |
| Tue 11 Aug 1998 | Ceredigion | 2 | 8 | Serious |
| Wed 12 Aug 1998 | Ceredigion | 2 | 2 | Slight |
| Fri 14 Aug 1998 | Pembrokeshire | 2 | 2 | Serious |
| Fri 14 Aug 1998 | Gwynedd | 3 | 2 | Slight |
| Sat 15 Aug 1998 | Powys | 4 | 2 | Slight |
| Sat 15 Aug 1998 | Gwynedd | 2 | 2 | Serious |
| Sat 15 Aug 1998 | Ceredigion | 2 | 1 | Slight |
| Mon 24 Aug 1998 | Gwynedd | 1 | 1 | Slight |
| Tue 25 Aug 1998 | Pembrokeshire | 2 | 1 | Slight |
| Wed 26 Aug 1998 | Gwynedd | 2 | 1 | Slight |
| Thu 27 Aug 1998 | Ceredigion | 2 | 1 | Slight |
| Tue 1 Sep 1998 | Gwynedd | 2 | 1 | Slight |
| Tue 1 Sep 1998 | Gwynedd | 2 | 2 | Slight |
| Fri 4 Sep 1998 | Gwynedd | 1 | 1 | Slight |
| Sun 6 Sep 1998 | Pembrokeshire | 2 | 2 | Serious |
| Thu 10 Sep 1998 | Gwynedd | 2 | 1 | Slight |
| Mon 14 Sep 1998 | Gwynedd | 2 | 2 | Slight |
| Mon 14 Sep 1998 | Gwynedd | 3 | 1 | Slight |
| Mon 21 Sep 1998 | Pembrokeshire | 2 | 1 | Slight |
| Thu 24 Sep 1998 | Ceredigion | 1 | 1 | Slight |
| Tue 29 Sep 1998 | Ceredigion | 3 | 1 | Slight |
| Fri 2 Oct 1998 | Ceredigion | 4 | 2 | Slight |
| Mon 5 Oct 1998 | Ceredigion | 2 | 4 | Serious |
| Thu 8 Oct 1998 | Ceredigion | 2 | 1 | Slight |
| Fri 9 Oct 1998 | Pembrokeshire | 1 | 2 | Serious |
| Thu 15 Oct 1998 | Gwynedd | 1 | 2 | Serious |
| Fri 16 Oct 1998 | Ceredigion | 2 | 2 | Slight |
| Fri 16 Oct 1998 | Ceredigion | 5 | 3 | Slight |
| Sat 17 Oct 1998 | Ceredigion | 1 | 1 | Slight |
| Tue 20 Oct 1998 | Pembrokeshire | 3 | 1 | Slight |
| Wed 21 Oct 1998 | Pembrokeshire | 2 | 1 | Slight |
| Fri 23 Oct 1998 | Ceredigion | 2 | 1 | Slight |
| Sun 25 Oct 1998 | Ceredigion | 2 | 2 | Fatal |
| Mon 26 Oct 1998 | Pembrokeshire | 2 | 1 | Serious |
| Tue 27 Oct 1998 | Gwynedd | 1 | 1 | Slight |
| Tue 27 Oct 1998 | Pembrokeshire | 1 | 1 | Slight |
| Thu 29 Oct 1998 | Gwynedd | 2 | 4 | Slight |
| Sat 31 Oct 1998 | Ceredigion | 2 | 1 | Slight |
| Mon 2 Nov 1998 | Gwynedd | 2 | 1 | Slight |
| Wed 4 Nov 1998 | Gwynedd | 2 | 1 | Slight |
| Wed 4 Nov 1998 | Gwynedd | 1 | 1 | Slight |
| Fri 6 Nov 1998 | Ceredigion | 2 | 1 | Slight |
| Mon 9 Nov 1998 | Gwynedd | 1 | 1 | Slight |
| Tue 10 Nov 1998 | Ceredigion | 2 | 1 | Slight |
| Thu 12 Nov 1998 | Gwynedd | 2 | 1 | Slight |
| Fri 13 Nov 1998 | Pembrokeshire | 2 | 1 | Slight |
| Fri 13 Nov 1998 | Ceredigion | 3 | 3 | Slight |
| Sun 15 Nov 1998 | Pembrokeshire | 1 | 1 | Slight |
| Thu 19 Nov 1998 | Pembrokeshire | 1 | 1 | Slight |
| Thu 19 Nov 1998 | Ceredigion | 3 | 2 | Slight |
| Sat 21 Nov 1998 | Gwynedd | 1 | 1 | Slight |
| Sat 21 Nov 1998 | Ceredigion | 2 | 1 | Slight |
| Sat 21 Nov 1998 | Ceredigion | 2 | 1 | Serious |
| Mon 23 Nov 1998 | Gwynedd | 2 | 1 | Slight |
| Thu 26 Nov 1998 | Ceredigion | 1 | 1 | Fatal |
| Mon 30 Nov 1998 | Ceredigion | 2 | 1 | Slight |
| Wed 2 Dec 1998 | Ceredigion | 3 | 1 | Slight |
| Fri 4 Dec 1998 | Gwynedd | 1 | 1 | Slight |
| Fri 4 Dec 1998 | Pembrokeshire | 2 | 1 | Slight |
| Tue 8 Dec 1998 | Gwynedd | 1 | 1 | Slight |
| Mon 14 Dec 1998 | Ceredigion | 4 | 1 | Slight |
| Tue 15 Dec 1998 | Ceredigion | 2 | 2 | Slight |
| Sat 19 Dec 1998 | Pembrokeshire | 1 | 1 | Serious |
| Mon 21 Dec 1998 | Gwynedd | 2 | 2 | Slight |
| Wed 23 Dec 1998 | Ceredigion | 2 | 4 | Slight |
| Thu 24 Dec 1998 | Gwynedd | 2 | 3 | Slight |
| Fri 25 Dec 1998 | Ceredigion | 2 | 1 | Slight |
| Sat 26 Dec 1998 | Gwynedd | 2 | 2 | Slight |
| Tue 29 Dec 1998 | Ceredigion | 3 | 4 | Serious |
| Thu 31 Dec 1998 | Pembrokeshire | 2 | 1 | Slight |