Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Thu 2 Jan 1986 | Broxbourne | 1 | 1 | Slight |
| Fri 3 Jan 1986 | Welwyn Hatfield | 1 | 1 | Slight |
| Thu 23 Jan 1986 | Broxbourne | 1 | 1 | Slight |
| Sun 26 Jan 1986 | Broxbourne | 2 | 2 | Slight |
| Tue 28 Jan 1986 | Broxbourne | 2 | 1 | Slight |
| Sat 1 Feb 1986 | Broxbourne | 2 | 1 | Slight |
| Tue 18 Feb 1986 | Hertsmere | 2 | 1 | Slight |
| Sat 22 Mar 1986 | Broxbourne | 1 | 2 | Slight |
| Mon 24 Mar 1986 | Welwyn Hatfield | 2 | 1 | Slight |
| Mon 24 Mar 1986 | Welwyn Hatfield | 2 | 1 | Slight |
| Sun 20 Apr 1986 | Broxbourne | 2 | 1 | Slight |
| Tue 22 Apr 1986 | Broxbourne | 2 | 1 | Slight |
| Thu 22 May 1986 | Broxbourne | 1 | 1 | Slight |
| Fri 23 May 1986 | Broxbourne | 2 | 1 | Slight |
| Sat 31 May 1986 | Welwyn Hatfield | 2 | 1 | Slight |
| Tue 3 Jun 1986 | Broxbourne | 2 | 1 | Slight |
| Wed 11 Jun 1986 | Broxbourne | 2 | 1 | Slight |
| Mon 23 Jun 1986 | Hertsmere | 2 | 2 | Slight |
| Thu 26 Jun 1986 | Welwyn Hatfield | 1 | 1 | Slight |
| Fri 27 Jun 1986 | Welwyn Hatfield | 2 | 1 | Slight |
| Mon 30 Jun 1986 | Broxbourne | 1 | 1 | Slight |
| Sat 5 Jul 1986 | Welwyn Hatfield | 2 | 1 | Slight |
| Sat 5 Jul 1986 | Welwyn Hatfield | 2 | 2 | Serious |
| Mon 21 Jul 1986 | Welwyn Hatfield | 1 | 2 | Slight |
| Sat 26 Jul 1986 | Welwyn Hatfield | 2 | 4 | Serious |
| Wed 30 Jul 1986 | Broxbourne | 2 | 2 | Slight |
| Fri 1 Aug 1986 | Broxbourne | 2 | 1 | Slight |
| Sat 16 Aug 1986 | Broxbourne | 1 | 1 | Serious |
| Tue 19 Aug 1986 | Broxbourne | 1 | 1 | Slight |
| Fri 22 Aug 1986 | Broxbourne | 2 | 1 | Slight |
| Sat 23 Aug 1986 | Welwyn Hatfield | 3 | 2 | Slight |
| Sat 23 Aug 1986 | Broxbourne | 2 | 1 | Slight |
| Sun 24 Aug 1986 | Broxbourne | 2 | 1 | Slight |
| Mon 1 Sep 1986 | Broxbourne | 2 | 1 | Slight |
| Thu 4 Sep 1986 | Broxbourne | 2 | 1 | Slight |
| Thu 4 Sep 1986 | Welwyn Hatfield | 2 | 1 | Slight |
| Sun 14 Sep 1986 | Welwyn Hatfield | 3 | 1 | Slight |
| Thu 18 Sep 1986 | Broxbourne | 2 | 3 | Slight |
| Fri 19 Sep 1986 | Welwyn Hatfield | 2 | 1 | Serious |
| Fri 26 Sep 1986 | Welwyn Hatfield | 3 | 1 | Slight |
| Tue 4 Nov 1986 | Welwyn Hatfield | 2 | 1 | Slight |
| Wed 5 Nov 1986 | Welwyn Hatfield | 1 | 1 | Slight |
| Sat 15 Nov 1986 | Welwyn Hatfield | 2 | 2 | Slight |
| Wed 19 Nov 1986 | Welwyn Hatfield | 3 | 1 | Slight |
| Mon 24 Nov 1986 | Hertsmere | 2 | 1 | Slight |
| Thu 27 Nov 1986 | Broxbourne | 1 | 1 | Slight |
| Mon 8 Dec 1986 | Hertsmere | 1 | 1 | Slight |
| Wed 10 Dec 1986 | Broxbourne | 3 | 1 | Slight |