Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Wed 10 Jan 1990 | Broxbourne | 1 | 1 | Serious |
| Fri 12 Jan 1990 | Broxbourne | 2 | 2 | Slight |
| Tue 23 Jan 1990 | Broxbourne | 2 | 1 | Slight |
| Sat 27 Jan 1990 | Broxbourne | 2 | 1 | Slight |
| Mon 29 Jan 1990 | Broxbourne | 2 | 2 | Slight |
| Mon 12 Feb 1990 | East Hertfordshire | 2 | 1 | Slight |
| Fri 16 Feb 1990 | Broxbourne | 1 | 1 | Slight |
| Mon 19 Feb 1990 | Broxbourne | 2 | 1 | Slight |
| Wed 21 Feb 1990 | Broxbourne | 2 | 1 | Slight |
| Thu 1 Mar 1990 | Broxbourne | 1 | 1 | Serious |
| Fri 9 Mar 1990 | Broxbourne | 2 | 1 | Slight |
| Fri 9 Mar 1990 | Broxbourne | 2 | 1 | Slight |
| Fri 23 Mar 1990 | Broxbourne | 1 | 1 | Slight |
| Fri 30 Mar 1990 | Broxbourne | 2 | 1 | Slight |
| Thu 12 Apr 1990 | Broxbourne | 2 | 1 | Slight |
| Fri 20 Apr 1990 | East Hertfordshire | 1 | 1 | Slight |
| Tue 1 May 1990 | East Hertfordshire | 2 | 1 | Slight |
| Fri 4 May 1990 | Broxbourne | 2 | 3 | Slight |
| Sat 5 May 1990 | Broxbourne | 1 | 1 | Slight |
| Tue 8 May 1990 | East Hertfordshire | 1 | 2 | Slight |
| Wed 9 May 1990 | Broxbourne | 3 | 1 | Slight |
| Fri 18 May 1990 | Broxbourne | 2 | 2 | Slight |
| Mon 21 May 1990 | Broxbourne | 2 | 1 | Slight |
| Thu 24 May 1990 | Broxbourne | 2 | 1 | Serious |
| Thu 24 May 1990 | Broxbourne | 2 | 1 | Slight |
| Mon 4 Jun 1990 | Broxbourne | 2 | 1 | Slight |
| Tue 5 Jun 1990 | Broxbourne | 2 | 1 | Slight |
| Wed 6 Jun 1990 | Broxbourne | 1 | 1 | Slight |
| Wed 13 Jun 1990 | East Hertfordshire | 2 | 1 | Slight |
| Wed 20 Jun 1990 | Broxbourne | 2 | 1 | Serious |
| Fri 22 Jun 1990 | Broxbourne | 2 | 1 | Slight |
| Fri 22 Jun 1990 | Broxbourne | 2 | 1 | Slight |
| Mon 25 Jun 1990 | Broxbourne | 2 | 1 | Slight |
| Wed 27 Jun 1990 | Broxbourne | 1 | 1 | Serious |
| Thu 12 Jul 1990 | East Hertfordshire | 2 | 1 | Slight |
| Mon 16 Jul 1990 | Broxbourne | 1 | 1 | Serious |
| Wed 25 Jul 1990 | East Hertfordshire | 2 | 1 | Slight |
| Tue 31 Jul 1990 | Broxbourne | 2 | 1 | Slight |
| Fri 3 Aug 1990 | Broxbourne | 2 | 1 | Slight |
| Mon 6 Aug 1990 | Broxbourne | 2 | 1 | Slight |
| Tue 7 Aug 1990 | Broxbourne | 2 | 1 | Slight |
| Tue 7 Aug 1990 | Broxbourne | 1 | 1 | Serious |
| Sat 11 Aug 1990 | Broxbourne | 2 | 1 | Slight |
| Sat 25 Aug 1990 | East Hertfordshire | 2 | 1 | Slight |
| Sun 26 Aug 1990 | Broxbourne | 2 | 1 | Slight |
| Sat 1 Sep 1990 | Broxbourne | 1 | 1 | Slight |
| Mon 10 Sep 1990 | Broxbourne | 2 | 3 | Slight |
| Fri 14 Sep 1990 | Broxbourne | 2 | 1 | Slight |
| Mon 17 Sep 1990 | Broxbourne | 1 | 1 | Slight |
| Tue 25 Sep 1990 | Broxbourne | 2 | 1 | Slight |
| Fri 28 Sep 1990 | East Hertfordshire | 2 | 1 | Slight |
| Sun 30 Sep 1990 | East Hertfordshire | 1 | 1 | Slight |
| Wed 3 Oct 1990 | Broxbourne | 2 | 1 | Slight |
| Sat 27 Oct 1990 | East Hertfordshire | 2 | 1 | Slight |
| Sun 28 Oct 1990 | Broxbourne | 2 | 1 | Serious |
| Mon 29 Oct 1990 | Broxbourne | 2 | 1 | Slight |
| Tue 30 Oct 1990 | East Hertfordshire | 3 | 1 | Serious |
| Wed 31 Oct 1990 | Broxbourne | 2 | 1 | Slight |
| Thu 1 Nov 1990 | East Hertfordshire | 3 | 1 | Slight |
| Fri 9 Nov 1990 | East Hertfordshire | 2 | 1 | Slight |
| Mon 26 Nov 1990 | Broxbourne | 2 | 1 | Slight |
| Mon 26 Nov 1990 | Broxbourne | 1 | 1 | Slight |
| Fri 30 Nov 1990 | Broxbourne | 2 | 1 | Slight |
| Sun 2 Dec 1990 | East Hertfordshire | 2 | 1 | Slight |
| Sat 8 Dec 1990 | Broxbourne | 1 | 1 | Slight |
| Sun 9 Dec 1990 | East Hertfordshire | 2 | 1 | Slight |
| Tue 11 Dec 1990 | East Hertfordshire | 2 | 2 | Slight |
| Fri 14 Dec 1990 | East Hertfordshire | 2 | 1 | Slight |
| Sat 22 Dec 1990 | East Hertfordshire | 1 | 1 | Slight |
| Thu 27 Dec 1990 | Broxbourne | 2 | 1 | Slight |
| Mon 31 Dec 1990 | Broxbourne | 2 | 1 | Slight |