Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Mon 8 Jan 1990 | East Hertfordshire | 2 | 1 | Slight |
| Sun 14 Jan 1990 | East Hertfordshire | 1 | 1 | Slight |
| Fri 19 Jan 1990 | Welwyn Hatfield | 2 | 1 | Slight |
| Sat 3 Feb 1990 | Welwyn Hatfield | 1 | 1 | Slight |
| Thu 8 Feb 1990 | East Hertfordshire | 2 | 1 | Slight |
| Mon 12 Feb 1990 | Welwyn Hatfield | 1 | 2 | Slight |
| Tue 20 Feb 1990 | East Hertfordshire | 1 | 1 | Slight |
| Wed 21 Feb 1990 | East Hertfordshire | 1 | 1 | Slight |
| Sun 25 Feb 1990 | East Hertfordshire | 1 | 1 | Slight |
| Mon 26 Feb 1990 | East Hertfordshire | 3 | 1 | Slight |
| Sun 25 Mar 1990 | East Hertfordshire | 2 | 2 | Slight |
| Tue 3 Apr 1990 | East Hertfordshire | 2 | 1 | Slight |
| Fri 20 Apr 1990 | East Hertfordshire | 3 | 1 | Slight |
| Mon 14 May 1990 | East Hertfordshire | 2 | 1 | Slight |
| Fri 1 Jun 1990 | Welwyn Hatfield | 2 | 2 | Slight |
| Thu 21 Jun 1990 | East Hertfordshire | 2 | 6 | Serious |
| Sat 7 Jul 1990 | East Hertfordshire | 2 | 1 | Slight |
| Wed 11 Jul 1990 | East Hertfordshire | 2 | 1 | Slight |
| Sun 15 Jul 1990 | Welwyn Hatfield | 2 | 1 | Slight |
| Tue 17 Jul 1990 | East Hertfordshire | 1 | 1 | Slight |
| Thu 25 Oct 1990 | East Hertfordshire | 2 | 1 | Slight |
| Mon 5 Nov 1990 | East Hertfordshire | 2 | 1 | Slight |
| Thu 8 Nov 1990 | East Hertfordshire | 1 | 1 | Serious |
| Wed 14 Nov 1990 | Welwyn Hatfield | 2 | 1 | Slight |