Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Fri 8 Jan 1999 | Cardiff | 4 | 2 | Slight |
| Sat 9 Jan 1999 | Cardiff | 2 | 1 | Slight |
| Thu 14 Jan 1999 | Cardiff | 2 | 1 | Slight |
| Thu 21 Jan 1999 | Cardiff | 2 | 1 | Serious |
| Thu 21 Jan 1999 | Cardiff | 2 | 3 | Slight |
| Fri 22 Jan 1999 | Cardiff | 2 | 2 | Slight |
| Fri 5 Feb 1999 | Cardiff | 2 | 1 | Slight |
| Mon 8 Feb 1999 | Cardiff | 2 | 1 | Slight |
| Tue 9 Feb 1999 | Cardiff | 2 | 1 | Slight |
| Fri 12 Feb 1999 | Cardiff | 1 | 1 | Slight |
| Tue 23 Feb 1999 | Cardiff | 2 | 1 | Slight |
| Tue 2 Mar 1999 | Cardiff | 2 | 2 | Slight |
| Tue 9 Mar 1999 | Cardiff | 3 | 1 | Slight |
| Thu 25 Mar 1999 | The Vale of Glamorgan | 2 | 1 | Slight |
| Tue 30 Mar 1999 | Cardiff | 1 | 3 | Slight |
| Thu 1 Apr 1999 | Cardiff | 1 | 2 | Slight |
| Sat 3 Apr 1999 | Cardiff | 1 | 1 | Slight |
| Thu 8 Apr 1999 | Cardiff | 2 | 1 | Slight |
| Tue 13 Apr 1999 | Cardiff | 2 | 2 | Slight |
| Mon 19 Apr 1999 | Cardiff | 2 | 1 | Slight |
| Sat 24 Apr 1999 | Cardiff | 4 | 4 | Slight |
| Tue 27 Apr 1999 | Cardiff | 1 | 1 | Slight |
| Fri 30 Apr 1999 | Cardiff | 3 | 1 | Slight |
| Fri 14 May 1999 | Cardiff | 3 | 2 | Slight |
| Sun 16 May 1999 | Cardiff | 1 | 1 | Slight |
| Sat 22 May 1999 | Cardiff | 2 | 1 | Slight |
| Tue 25 May 1999 | Cardiff | 1 | 1 | Slight |
| Thu 27 May 1999 | Cardiff | 2 | 2 | Serious |
| Sun 30 May 1999 | Cardiff | 2 | 1 | Slight |
| Tue 1 Jun 1999 | Cardiff | 2 | 1 | Slight |
| Wed 9 Jun 1999 | Cardiff | 2 | 2 | Slight |
| Wed 16 Jun 1999 | Cardiff | 2 | 1 | Slight |
| Sun 27 Jun 1999 | Cardiff | 2 | 1 | Slight |
| Sat 3 Jul 1999 | Cardiff | 1 | 3 | Serious |
| Thu 15 Jul 1999 | Cardiff | 1 | 1 | Slight |
| Sun 18 Jul 1999 | Cardiff | 1 | 2 | Slight |
| Sun 18 Jul 1999 | Cardiff | 1 | 1 | Serious |
| Mon 26 Jul 1999 | Cardiff | 2 | 1 | Slight |
| Fri 13 Aug 1999 | Cardiff | 1 | 1 | Slight |
| Fri 13 Aug 1999 | Cardiff | 2 | 1 | Slight |
| Fri 13 Aug 1999 | Cardiff | 2 | 4 | Slight |
| Mon 16 Aug 1999 | Cardiff | 2 | 1 | Slight |
| Sat 28 Aug 1999 | Cardiff | 2 | 1 | Slight |
| Fri 3 Sep 1999 | Cardiff | 1 | 2 | Slight |
| Thu 23 Sep 1999 | Cardiff | 2 | 1 | Slight |
| Sun 26 Sep 1999 | Cardiff | 1 | 1 | Serious |
| Wed 6 Oct 1999 | Cardiff | 2 | 1 | Slight |
| Wed 13 Oct 1999 | Cardiff | 4 | 3 | Slight |
| Fri 15 Oct 1999 | Cardiff | 2 | 1 | Slight |
| Sat 16 Oct 1999 | Cardiff | 1 | 4 | Slight |
| Sat 16 Oct 1999 | Cardiff | 2 | 2 | Slight |
| Thu 21 Oct 1999 | Cardiff | 1 | 2 | Slight |
| Sun 24 Oct 1999 | The Vale of Glamorgan | 1 | 1 | Slight |
| Wed 27 Oct 1999 | Cardiff | 1 | 1 | Slight |
| Mon 1 Nov 1999 | Cardiff | 2 | 1 | Slight |
| Fri 5 Nov 1999 | Cardiff | 1 | 2 | Slight |
| Tue 30 Nov 1999 | Cardiff | 2 | 1 | Serious |
| Fri 3 Dec 1999 | Cardiff | 2 | 2 | Slight |
| Wed 8 Dec 1999 | Cardiff | 2 | 1 | Slight |
| Thu 16 Dec 1999 | Cardiff | 2 | 1 | Slight |
| Sun 19 Dec 1999 | Cardiff | 1 | 1 | Slight |
| Mon 27 Dec 1999 | Cardiff | 1 | 1 | Slight |
| Tue 28 Dec 1999 | Cardiff | 3 | 1 | Serious |
| Tue 28 Dec 1999 | Cardiff | 4 | 2 | Slight |
| Tue 28 Dec 1999 | Cardiff | 3 | 1 | Slight |