Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Wed 3 Jan 1990 | North Hertfordshire | 3 | 1 | Serious |
| Fri 16 Mar 1990 | North Hertfordshire | 3 | 1 | Slight |
| Mon 21 May 1990 | North Hertfordshire | 2 | 1 | Serious |
| Thu 7 Jun 1990 | North Hertfordshire | 2 | 1 | Slight |
| Fri 8 Jun 1990 | North Hertfordshire | 2 | 1 | Slight |
| Tue 24 Jul 1990 | North Hertfordshire | 2 | 1 | Slight |
| Fri 17 Aug 1990 | North Hertfordshire | 2 | 1 | Slight |
| Thu 20 Sep 1990 | North Hertfordshire | 2 | 1 | Serious |
| Mon 24 Sep 1990 | North Hertfordshire | 2 | 1 | Slight |
| Sat 29 Sep 1990 | North Hertfordshire | 2 | 1 | Slight |
| Wed 3 Oct 1990 | North Hertfordshire | 1 | 2 | Slight |
| Fri 12 Oct 1990 | North Hertfordshire | 2 | 1 | Slight |
| Tue 16 Oct 1990 | North Hertfordshire | 2 | 1 | Slight |
| Sat 24 Nov 1990 | North Hertfordshire | 1 | 1 | Slight |
| Thu 29 Nov 1990 | North Hertfordshire | 6 | 3 | Slight |
| Tue 4 Dec 1990 | North Hertfordshire | 2 | 2 | Serious |
| Sat 22 Dec 1990 | North Hertfordshire | 1 | 1 | Serious |
| Sun 30 Dec 1990 | North Hertfordshire | 2 | 1 | Serious |