Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Sat 27 Jan 1990 | East Hertfordshire | 1 | 1 | Slight |
| Sat 27 Jan 1990 | Welwyn Hatfield | 1 | 1 | Slight |
| Thu 1 Feb 1990 | Welwyn Hatfield | 4 | 2 | Slight |
| Fri 16 Feb 1990 | East Hertfordshire | 2 | 1 | Slight |
| Sun 4 Mar 1990 | Welwyn Hatfield | 2 | 2 | Slight |
| Wed 28 Mar 1990 | Welwyn Hatfield | 2 | 1 | Slight |
| Wed 28 Mar 1990 | Welwyn Hatfield | 2 | 1 | Slight |
| Thu 26 Apr 1990 | Welwyn Hatfield | 2 | 1 | Slight |
| Thu 7 Jun 1990 | Welwyn Hatfield | 2 | 1 | Slight |
| Thu 21 Jun 1990 | East Hertfordshire | 3 | 1 | Serious |
| Tue 3 Jul 1990 | East Hertfordshire | 1 | 1 | Serious |
| Fri 27 Jul 1990 | Welwyn Hatfield | 1 | 2 | Slight |
| Thu 9 Aug 1990 | East Hertfordshire | 3 | 2 | Slight |
| Wed 22 Aug 1990 | Welwyn Hatfield | 1 | 1 | Serious |
| Sat 25 Aug 1990 | Welwyn Hatfield | 1 | 2 | Slight |
| Sat 1 Sep 1990 | East Hertfordshire | 4 | 1 | Slight |
| Fri 14 Sep 1990 | Welwyn Hatfield | 1 | 1 | Serious |
| Tue 6 Nov 1990 | East Hertfordshire | 1 | 1 | Slight |
| Fri 23 Nov 1990 | Welwyn Hatfield | 2 | 1 | Serious |
| Fri 23 Nov 1990 | Welwyn Hatfield | 2 | 1 | Serious |
| Fri 14 Dec 1990 | Welwyn Hatfield | 1 | 2 | Slight |