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