Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Sat 2 Jan 1999 | Powys | 1 | 1 | Slight |
| Sat 2 Jan 1999 | Carmarthenshire | 2 | 1 | Slight |
| Mon 4 Jan 1999 | Carmarthenshire | 2 | 1 | Serious |
| Fri 8 Jan 1999 | Wrexham | 2 | 1 | Slight |
| Fri 15 Jan 1999 | Swansea | 4 | 1 | Slight |
| Sat 16 Jan 1999 | Chester | 2 | 1 | Slight |
| Thu 21 Jan 1999 | Swansea | 2 | 1 | Slight |
| Sun 24 Jan 1999 | Swansea | 2 | 2 | Slight |
| Tue 26 Jan 1999 | Powys | 2 | 1 | Slight |
| Thu 28 Jan 1999 | Gwynedd | 3 | 2 | Slight |
| Fri 29 Jan 1999 | Powys | 1 | 1 | Slight |
| Sat 30 Jan 1999 | Carmarthenshire | 3 | 1 | Slight |
| Mon 1 Feb 1999 | Chester | 1 | 1 | Slight |
| Mon 1 Feb 1999 | Powys | 1 | 1 | Slight |
| Wed 3 Feb 1999 | Swansea | 1 | 1 | Fatal |
| Fri 5 Feb 1999 | Carmarthenshire | 2 | 1 | Slight |
| Fri 5 Feb 1999 | Wrexham | 1 | 1 | Slight |
| Wed 10 Feb 1999 | Wrexham | 2 | 1 | Slight |
| Wed 10 Feb 1999 | Chester | 2 | 1 | Slight |
| Sat 13 Feb 1999 | Powys | 1 | 1 | Slight |
| Sun 14 Feb 1999 | Neath Port Talbot | 1 | 2 | Slight |
| Mon 15 Feb 1999 | Powys | 2 | 1 | Serious |
| Tue 16 Feb 1999 | Powys | 2 | 1 | Fatal |
| Mon 22 Feb 1999 | Wrexham | 2 | 1 | Slight |
| Wed 24 Feb 1999 | Carmarthenshire | 3 | 2 | Serious |
| Fri 26 Feb 1999 | Wrexham | 2 | 1 | Slight |
| Fri 26 Feb 1999 | Powys | 4 | 1 | Slight |
| Mon 1 Mar 1999 | Wrexham | 3 | 1 | Slight |
| Tue 2 Mar 1999 | Wrexham | 2 | 1 | Slight |
| Thu 4 Mar 1999 | Wrexham | 2 | 1 | Slight |
| Sun 7 Mar 1999 | Neath Port Talbot | 1 | 1 | Slight |
| Thu 11 Mar 1999 | Swansea | 2 | 1 | Slight |
| Sat 13 Mar 1999 | Chester | 1 | 1 | Slight |
| Mon 15 Mar 1999 | Oswestry | 2 | 2 | Slight |
| Thu 18 Mar 1999 | Oswestry | 2 | 1 | Serious |
| Fri 19 Mar 1999 | Carmarthenshire | 3 | 1 | Serious |
| Wed 24 Mar 1999 | North Shropshire | 2 | 1 | Slight |
| Thu 25 Mar 1999 | Wrexham | 3 | 3 | Slight |
| Sat 3 Apr 1999 | Powys | 1 | 1 | Slight |
| Sat 3 Apr 1999 | Carmarthenshire | 2 | 1 | Slight |
| Sun 4 Apr 1999 | Oswestry | 1 | 1 | Serious |
| Sat 10 Apr 1999 | Carmarthenshire | 2 | 1 | Serious |
| Sat 10 Apr 1999 | Carmarthenshire | 3 | 1 | Slight |
| Tue 13 Apr 1999 | Powys | 2 | 1 | Slight |
| Tue 13 Apr 1999 | Wrexham | 2 | 1 | Slight |
| Thu 15 Apr 1999 | Chester | 3 | 1 | Slight |
| Thu 15 Apr 1999 | Chester | 2 | 1 | Slight |
| Sat 17 Apr 1999 | Wrexham | 3 | 7 | Serious |
| Mon 26 Apr 1999 | Wrexham | 1 | 1 | Slight |
| Mon 26 Apr 1999 | Wrexham | 1 | 1 | Slight |
| Mon 26 Apr 1999 | Chester | 2 | 1 | Slight |
| Tue 27 Apr 1999 | Swansea | 1 | 1 | Fatal |
| Thu 29 Apr 1999 | Carmarthenshire | 2 | 2 | Slight |
| Sun 2 May 1999 | Powys | 2 | 2 | Serious |
| Mon 3 May 1999 | Chester | 2 | 1 | Slight |
| Mon 3 May 1999 | Carmarthenshire | 2 | 1 | Slight |
| Sat 8 May 1999 | Powys | 1 | 1 | Serious |
| Mon 10 May 1999 | Powys | 1 | 1 | Slight |
| Wed 12 May 1999 | Wrexham | 2 | 2 | Fatal |
| Thu 13 May 1999 | Wrexham | 1 | 1 | Slight |
| Mon 17 May 1999 | Oswestry | 2 | 1 | Slight |
| Thu 20 May 1999 | Chester | 2 | 1 | Slight |
| Fri 21 May 1999 | Neath Port Talbot | 1 | 1 | Slight |
| Fri 21 May 1999 | Carmarthenshire | 2 | 1 | Slight |
| Sat 22 May 1999 | Powys | 2 | 1 | Slight |
| Mon 24 May 1999 | Chester | 2 | 1 | Slight |
| Wed 26 May 1999 | Powys | 2 | 1 | Slight |
| Fri 28 May 1999 | Wrexham | 1 | 1 | Slight |
| Sat 29 May 1999 | Powys | 1 | 2 | Slight |
| Mon 31 May 1999 | Carmarthenshire | 1 | 1 | Slight |
| Tue 1 Jun 1999 | Chester | 3 | 1 | Slight |
| Wed 2 Jun 1999 | North Shropshire | 2 | 1 | Slight |
| Thu 3 Jun 1999 | Carmarthenshire | 2 | 1 | Slight |
| Thu 3 Jun 1999 | Powys | 2 | 1 | Serious |
| Sun 6 Jun 1999 | Wrexham | 2 | 2 | Slight |
| Mon 7 Jun 1999 | Chester | 3 | 1 | Slight |
| Fri 11 Jun 1999 | Powys | 3 | 2 | Slight |
| Fri 11 Jun 1999 | Powys | 3 | 2 | Serious |
| Sat 12 Jun 1999 | Chester | 4 | 1 | Slight |
| Thu 17 Jun 1999 | Powys | 2 | 1 | Slight |
| Fri 18 Jun 1999 | Powys | 2 | 2 | Slight |
| Fri 18 Jun 1999 | Wrexham | 1 | 2 | Serious |
| Fri 18 Jun 1999 | Powys | 2 | 1 | Slight |
| Sat 19 Jun 1999 | Powys | 1 | 1 | Slight |
| Sun 20 Jun 1999 | Powys | 1 | 2 | Serious |
| Sun 20 Jun 1999 | Carmarthenshire | 2 | 1 | Slight |
| Tue 22 Jun 1999 | Wrexham | 2 | 2 | Slight |
| Sat 26 Jun 1999 | Carmarthenshire | 2 | 3 | Serious |
| Sat 26 Jun 1999 | Powys | 2 | 1 | Slight |
| Sun 27 Jun 1999 | Wrexham | 2 | 2 | Slight |
| Sun 27 Jun 1999 | Wrexham | 1 | 1 | Slight |
| Mon 28 Jun 1999 | Powys | 2 | 1 | Slight |
| Sat 3 Jul 1999 | Carmarthenshire | 2 | 2 | Slight |
| Sat 3 Jul 1999 | Powys | 2 | 1 | Slight |
| Sun 4 Jul 1999 | Chester | 2 | 1 | Slight |
| Tue 6 Jul 1999 | Wrexham | 2 | 1 | Slight |
| Fri 9 Jul 1999 | Powys | 1 | 2 | Serious |
| Sun 11 Jul 1999 | Powys | 2 | 1 | Slight |
| Tue 13 Jul 1999 | Chester | 2 | 2 | Slight |
| Fri 16 Jul 1999 | Powys | 5 | 1 | Serious |
| Fri 30 Jul 1999 | Wrexham | 2 | 1 | Slight |
| Mon 2 Aug 1999 | Carmarthenshire | 1 | 2 | Serious |
| Mon 2 Aug 1999 | Carmarthenshire | 2 | 1 | Slight |
| Wed 4 Aug 1999 | Powys | 1 | 1 | Slight |
| Fri 6 Aug 1999 | Carmarthenshire | 2 | 1 | Slight |
| Sat 7 Aug 1999 | Powys | 2 | 1 | Slight |
| Sun 8 Aug 1999 | Powys | 4 | 1 | Slight |
| Mon 16 Aug 1999 | Oswestry | 2 | 1 | Slight |
| Tue 17 Aug 1999 | Wrexham | 1 | 2 | Slight |
| Thu 19 Aug 1999 | Swansea | 1 | 1 | Serious |
| Sat 21 Aug 1999 | Carmarthenshire | 2 | 1 | Slight |
| Tue 24 Aug 1999 | Powys | 3 | 4 | Slight |
| Wed 25 Aug 1999 | Powys | 2 | 1 | Slight |
| Wed 25 Aug 1999 | Chester | 1 | 1 | Slight |
| Thu 26 Aug 1999 | Wrexham | 1 | 1 | Slight |
| Sat 28 Aug 1999 | Powys | 2 | 2 | Serious |
| Sun 29 Aug 1999 | Neath Port Talbot | 1 | 1 | Slight |
| Sun 29 Aug 1999 | Carmarthenshire | 2 | 3 | Slight |
| Thu 2 Sep 1999 | Wrexham | 2 | 1 | Slight |
| Sun 5 Sep 1999 | Powys | 2 | 1 | Slight |
| Wed 8 Sep 1999 | Carmarthenshire | 2 | 2 | Slight |
| Thu 9 Sep 1999 | Chester | 1 | 1 | Slight |
| Thu 9 Sep 1999 | Chester | 2 | 1 | Slight |
| Sun 12 Sep 1999 | Chester | 2 | 1 | Slight |
| Mon 13 Sep 1999 | Swansea | 2 | 2 | Slight |
| Tue 14 Sep 1999 | Swansea | 2 | 1 | Slight |
| Fri 17 Sep 1999 | Powys | 2 | 4 | Serious |
| Sat 18 Sep 1999 | Carmarthenshire | 2 | 1 | Serious |
| Sun 19 Sep 1999 | Swansea | 2 | 2 | Slight |
| Tue 21 Sep 1999 | Carmarthenshire | 1 | 1 | Serious |
| Mon 27 Sep 1999 | Wrexham | 2 | 1 | Slight |
| Wed 29 Sep 1999 | Wrexham | 2 | 2 | Slight |
| Wed 29 Sep 1999 | Powys | 1 | 1 | Slight |
| Thu 30 Sep 1999 | Powys | 1 | 1 | Serious |
| Fri 1 Oct 1999 | Chester | 1 | 1 | Slight |
| Fri 1 Oct 1999 | Powys | 2 | 1 | Slight |
| Fri 1 Oct 1999 | Powys | 3 | 1 | Slight |
| Sun 3 Oct 1999 | Wrexham | 1 | 1 | Slight |
| Thu 7 Oct 1999 | Oswestry | 2 | 2 | Slight |
| Thu 7 Oct 1999 | Powys | 2 | 1 | Slight |
| Fri 8 Oct 1999 | Wrexham | 2 | 3 | Serious |
| Sat 9 Oct 1999 | Powys | 2 | 2 | Slight |
| Sun 10 Oct 1999 | Powys | 2 | 3 | Fatal |
| Mon 11 Oct 1999 | Wrexham | 3 | 3 | Slight |
| Thu 14 Oct 1999 | Chester | 2 | 1 | Slight |
| Sun 17 Oct 1999 | Chester | 3 | 2 | Slight |
| Tue 19 Oct 1999 | Wrexham | 4 | 4 | Serious |
| Wed 20 Oct 1999 | Chester | 2 | 2 | Slight |
| Thu 21 Oct 1999 | Wrexham | 2 | 3 | Serious |
| Thu 21 Oct 1999 | Wrexham | 4 | 1 | Slight |
| Thu 21 Oct 1999 | Wrexham | 2 | 2 | Slight |
| Fri 22 Oct 1999 | Wrexham | 2 | 2 | Slight |
| Fri 22 Oct 1999 | Wrexham | 2 | 1 | Slight |
| Sat 23 Oct 1999 | Oswestry | 2 | 4 | Serious |
| Sun 24 Oct 1999 | Chester | 3 | 4 | Serious |
| Mon 25 Oct 1999 | Powys | 2 | 1 | Slight |
| Mon 25 Oct 1999 | Wrexham | 2 | 1 | Slight |
| Mon 25 Oct 1999 | Powys | 1 | 1 | Slight |
| Tue 26 Oct 1999 | Swansea | 2 | 1 | Slight |
| Sun 31 Oct 1999 | Powys | 1 | 1 | Serious |
| Fri 5 Nov 1999 | Wrexham | 2 | 2 | Serious |
| Mon 8 Nov 1999 | Chester | 2 | 4 | Slight |
| Wed 10 Nov 1999 | Oswestry | 2 | 2 | Fatal |
| Fri 12 Nov 1999 | Chester | 2 | 2 | Slight |
| Sat 13 Nov 1999 | Powys | 2 | 1 | Slight |
| Sun 14 Nov 1999 | Wrexham | 1 | 1 | Slight |
| Mon 15 Nov 1999 | Chester | 2 | 2 | Slight |
| Tue 16 Nov 1999 | Carmarthenshire | 2 | 1 | Slight |
| Thu 18 Nov 1999 | Chester | 2 | 1 | Slight |
| Thu 18 Nov 1999 | Chester | 2 | 1 | Slight |
| Sat 20 Nov 1999 | Powys | 2 | 1 | Slight |
| Sat 20 Nov 1999 | Powys | 1 | 3 | Slight |
| Mon 22 Nov 1999 | Chester | 2 | 1 | Slight |
| Mon 22 Nov 1999 | Powys | 2 | 4 | Slight |
| Thu 25 Nov 1999 | Swansea | 3 | 2 | Slight |
| Fri 26 Nov 1999 | Carmarthenshire | 2 | 3 | Slight |
| Fri 26 Nov 1999 | Wrexham | 2 | 1 | Slight |
| Sun 28 Nov 1999 | Powys | 1 | 2 | Slight |
| Tue 30 Nov 1999 | Chester | 2 | 1 | Slight |
| Fri 3 Dec 1999 | Powys | 3 | 1 | Serious |
| Fri 3 Dec 1999 | Swansea | 1 | 1 | Slight |
| Sat 4 Dec 1999 | Wrexham | 3 | 2 | Slight |
| Sat 4 Dec 1999 | Neath Port Talbot | 1 | 2 | Slight |
| Sun 5 Dec 1999 | Carmarthenshire | 3 | 1 | Slight |
| Mon 6 Dec 1999 | Wrexham | 2 | 2 | Slight |
| Tue 7 Dec 1999 | Swansea | 2 | 1 | Slight |
| Wed 8 Dec 1999 | Swansea | 1 | 1 | Slight |
| Sat 11 Dec 1999 | Carmarthenshire | 2 | 2 | Slight |
| Sun 12 Dec 1999 | Wrexham | 1 | 1 | Fatal |
| Sun 12 Dec 1999 | Wrexham | 1 | 1 | Fatal |
| Mon 13 Dec 1999 | Powys | 1 | 1 | Slight |
| Tue 14 Dec 1999 | Powys | 1 | 1 | Slight |
| Tue 14 Dec 1999 | Swansea | 2 | 1 | Slight |
| Fri 17 Dec 1999 | Oswestry | 2 | 1 | Slight |
| Sun 19 Dec 1999 | Swansea | 1 | 2 | Serious |
| Wed 22 Dec 1999 | Wrexham | 2 | 1 | Slight |
| Thu 23 Dec 1999 | Neath Port Talbot | 1 | 1 | Slight |
| Sat 25 Dec 1999 | Swansea | 1 | 1 | Serious |
| Mon 27 Dec 1999 | Swansea | 4 | 1 | Slight |
| Mon 27 Dec 1999 | Wrexham | 2 | 1 | Slight |
| Tue 28 Dec 1999 | Swansea | 2 | 1 | Slight |
| Thu 30 Dec 1999 | Swansea | 2 | 1 | Slight |