Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Tue 5 Jan 1999 | Torfaen | 2 | 1 | Slight |
| Tue 12 Jan 1999 | Caerphilly | 2 | 2 | Slight |
| Wed 13 Jan 1999 | Caerphilly | 1 | 1 | Serious |
| Sat 16 Jan 1999 | Caerphilly | 1 | 1 | Slight |
| Sat 23 Jan 1999 | Torfaen | 2 | 1 | Slight |
| Tue 2 Mar 1999 | Torfaen | 2 | 2 | Slight |
| Tue 9 Mar 1999 | Caerphilly | 1 | 2 | Serious |
| Tue 9 Mar 1999 | Caerphilly | 2 | 2 | Slight |
| Mon 15 Mar 1999 | Torfaen | 1 | 1 | Serious |
| Wed 31 Mar 1999 | Caerphilly | 2 | 1 | Serious |
| Thu 1 Apr 1999 | Monmouthshire | 1 | 1 | Slight |
| Sat 10 Apr 1999 | Caerphilly | 2 | 1 | Serious |
| Mon 12 Apr 1999 | Caerphilly | 2 | 1 | Slight |
| Wed 14 Apr 1999 | Caerphilly | 3 | 2 | Slight |
| Tue 20 Apr 1999 | Torfaen | 2 | 1 | Slight |
| Wed 21 Apr 1999 | Torfaen | 2 | 2 | Slight |
| Sat 24 Apr 1999 | Caerphilly | 2 | 3 | Slight |
| Wed 28 Apr 1999 | Caerphilly | 2 | 1 | Slight |
| Fri 30 Apr 1999 | Torfaen | 1 | 1 | Slight |
| Fri 30 Apr 1999 | Caerphilly | 2 | 3 | Slight |
| Wed 5 May 1999 | Torfaen | 2 | 2 | Slight |
| Fri 7 May 1999 | Caerphilly | 1 | 1 | Serious |
| Tue 18 May 1999 | Torfaen | 3 | 1 | Slight |
| Sat 22 May 1999 | Monmouthshire | 2 | 3 | Slight |
| Wed 26 May 1999 | Torfaen | 7 | 1 | Slight |
| Mon 21 Jun 1999 | Torfaen | 4 | 1 | Slight |
| Thu 1 Jul 1999 | Torfaen | 4 | 3 | Slight |
| Mon 12 Jul 1999 | Torfaen | 2 | 1 | Slight |
| Mon 12 Jul 1999 | Blaenau Gwent | 1 | 1 | Serious |
| Fri 16 Jul 1999 | Caerphilly | 2 | 1 | Slight |
| Sat 17 Jul 1999 | Monmouthshire | 2 | 1 | Slight |
| Thu 30 Sep 1999 | Caerphilly | 2 | 1 | Slight |
| Thu 7 Oct 1999 | Monmouthshire | 2 | 1 | Slight |
| Wed 3 Nov 1999 | Caerphilly | 2 | 1 | Slight |
| Fri 5 Nov 1999 | Caerphilly | 2 | 1 | Slight |
| Mon 8 Nov 1999 | Monmouthshire | 3 | 1 | Serious |
| Tue 9 Nov 1999 | Torfaen | 3 | 4 | Slight |
| Fri 19 Nov 1999 | Torfaen | 3 | 3 | Slight |
| Tue 30 Nov 1999 | Monmouthshire | 2 | 2 | Slight |
| Fri 3 Dec 1999 | Torfaen | 2 | 1 | Slight |
| Sun 12 Dec 1999 | Caerphilly | 1 | 1 | Slight |
| Sat 18 Dec 1999 | Caerphilly | 2 | 4 | Slight |
| Wed 22 Dec 1999 | Monmouthshire | 3 | 1 | Slight |