Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Sun 21 Jan 1990 | East Hertfordshire | 2 | 1 | Slight |
| Wed 24 Jan 1990 | Welwyn Hatfield | 2 | 1 | Slight |
| Mon 5 Feb 1990 | Welwyn Hatfield | 1 | 1 | Slight |
| Wed 21 Feb 1990 | Welwyn Hatfield | 2 | 1 | Slight |
| Mon 26 Feb 1990 | Welwyn Hatfield | 2 | 1 | Slight |
| Mon 2 Apr 1990 | East Hertfordshire | 2 | 2 | Slight |
| Sat 14 Apr 1990 | East Hertfordshire | 2 | 1 | Slight |
| Fri 27 Apr 1990 | Welwyn Hatfield | 2 | 1 | Slight |
| Wed 20 Jun 1990 | Welwyn Hatfield | 2 | 2 | Slight |
| Thu 5 Jul 1990 | Welwyn Hatfield | 2 | 1 | Slight |
| Wed 18 Jul 1990 | Welwyn Hatfield | 2 | 1 | Slight |
| Mon 6 Aug 1990 | Welwyn Hatfield | 2 | 1 | Slight |
| Sat 29 Sep 1990 | Welwyn Hatfield | 1 | 1 | Slight |
| Thu 25 Oct 1990 | Welwyn Hatfield | 2 | 1 | Slight |
| Fri 2 Nov 1990 | Welwyn Hatfield | 2 | 4 | Serious |
| Sun 4 Nov 1990 | Welwyn Hatfield | 1 | 1 | Slight |
| Sun 4 Nov 1990 | Welwyn Hatfield | 1 | 1 | Slight |
| Sat 17 Nov 1990 | East Hertfordshire | 1 | 1 | Slight |
| Fri 23 Nov 1990 | East Hertfordshire | 2 | 2 | Serious |
| Fri 14 Dec 1990 | Welwyn Hatfield | 2 | 1 | Slight |