Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Thu 14 Jan 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Thu 14 Jan 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Fri 15 Jan 1999 | Welwyn Hatfield | 3 | 1 | Slight |
| Fri 15 Jan 1999 | Welwyn Hatfield | 1 | 1 | Slight |
| Tue 19 Jan 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Tue 19 Jan 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Fri 5 Feb 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Thu 25 Feb 1999 | Welwyn Hatfield | 3 | 4 | Slight |
| Tue 2 Mar 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Thu 11 Mar 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Thu 11 Mar 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Wed 17 Mar 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Sun 21 Mar 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Sun 21 Mar 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Tue 23 Mar 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Sat 10 Apr 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Tue 13 Apr 1999 | Welwyn Hatfield | 2 | 1 | Serious |
| Fri 23 Apr 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Mon 26 Apr 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Mon 10 May 1999 | Welwyn Hatfield | 2 | 2 | Slight |
| Thu 20 May 1999 | Welwyn Hatfield | 3 | 1 | Slight |
| Fri 4 Jun 1999 | Welwyn Hatfield | 2 | 3 | Slight |
| Tue 22 Jun 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Sat 26 Jun 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Sat 17 Jul 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Wed 28 Jul 1999 | Welwyn Hatfield | 2 | 2 | Slight |
| Mon 23 Aug 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Wed 25 Aug 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Wed 25 Aug 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Tue 31 Aug 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Thu 2 Sep 1999 | Welwyn Hatfield | 1 | 1 | Slight |
| Fri 3 Sep 1999 | Welwyn Hatfield | 1 | 1 | Slight |
| Thu 16 Sep 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Mon 4 Oct 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Mon 1 Nov 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Thu 11 Nov 1999 | Welwyn Hatfield | 2 | 2 | Slight |
| Mon 15 Nov 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Mon 15 Nov 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Thu 18 Nov 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Thu 18 Nov 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Thu 25 Nov 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Fri 26 Nov 1999 | Welwyn Hatfield | 2 | 1 | Slight |
| Sat 27 Nov 1999 | Welwyn Hatfield | 2 | 2 | Slight |
| Fri 3 Dec 1999 | Welwyn Hatfield | 2 | 1 | Serious |
| Sun 12 Dec 1999 | Welwyn Hatfield | 2 | 1 | Slight |