Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Sun 1 Jan 1989 | Welwyn Hatfield | 2 | 2 | Serious |
| Mon 9 Jan 1989 | Welwyn Hatfield | 2 | 1 | Slight |
| Wed 18 Jan 1989 | Welwyn Hatfield | 2 | 1 | Slight |
| Wed 25 Jan 1989 | East Hertfordshire | 2 | 1 | Slight |
| Thu 30 Mar 1989 | Welwyn Hatfield | 2 | 2 | Slight |
| Sat 1 Apr 1989 | Welwyn Hatfield | 1 | 2 | Serious |
| Tue 4 Apr 1989 | Welwyn Hatfield | 2 | 1 | Slight |
| Tue 4 Apr 1989 | Welwyn Hatfield | 2 | 1 | Slight |
| Mon 8 May 1989 | Welwyn Hatfield | 2 | 2 | Serious |
| Tue 23 May 1989 | Welwyn Hatfield | 2 | 1 | Slight |
| Mon 29 May 1989 | Welwyn Hatfield | 2 | 1 | Slight |
| Tue 20 Jun 1989 | Welwyn Hatfield | 3 | 1 | Slight |
| Tue 20 Jun 1989 | East Hertfordshire | 2 | 1 | Slight |
| Wed 2 Aug 1989 | Welwyn Hatfield | 2 | 1 | Slight |
| Wed 2 Aug 1989 | Welwyn Hatfield | 2 | 1 | Slight |
| Mon 23 Oct 1989 | East Hertfordshire | 2 | 2 | Slight |
| Tue 24 Oct 1989 | Welwyn Hatfield | 1 | 2 | Serious |
| Fri 27 Oct 1989 | East Hertfordshire | 3 | 1 | Slight |
| Sat 28 Oct 1989 | East Hertfordshire | 2 | 1 | Slight |
| Fri 17 Nov 1989 | Welwyn Hatfield | 2 | 3 | Slight |
| Thu 30 Nov 1989 | East Hertfordshire | 2 | 2 | Serious |