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