Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Mon 11 Jan 1999 | Welwyn Hatfield | 1 | 1 | Serious |
| Thu 18 Feb 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Tue 23 Mar 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Sat 27 Mar 1999 | Welwyn Hatfield | 2 | 2 | Slight |
| Thu 1 Apr 1999 | Welwyn Hatfield | 1 | 1 | Serious |
| Wed 5 May 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Sat 15 May 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Sun 23 May 1999 | Welwyn Hatfield | 2 | 2 | Serious |
| Wed 2 Jun 1999 | Welwyn Hatfield | 3 | 1 | Slight |
| Thu 3 Jun 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Fri 2 Jul 1999 | Welwyn Hatfield | 3 | 1 | Slight |
| Mon 19 Jul 1999 | East Hertfordshire | 2 | 1 | Slight |
| Tue 27 Jul 1999 | Welwyn Hatfield | 3 | 1 | Slight |
| Sat 16 Oct 1999 | Welwyn Hatfield | 2 | 2 | Slight |
| Mon 25 Oct 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Sat 30 Oct 1999 | Welwyn Hatfield | 3 | 2 | Slight |
| Thu 4 Nov 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Mon 22 Nov 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Mon 29 Nov 1999 | Welwyn Hatfield | 2 | 2 | Slight |
| Mon 29 Nov 1999 | Welwyn Hatfield | 2 | 2 | Slight |
| Wed 1 Dec 1999 | Welwyn Hatfield | 3 | 1 | Slight |
| Thu 16 Dec 1999 | Welwyn Hatfield | 3 | 1 | Slight |
| Wed 22 Dec 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Wed 22 Dec 1999 | Welwyn Hatfield | 2 | 1 | Slight |