Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Tue 28 Jan 1986 | East Hertfordshire | 1 | 1 | Slight |
| Wed 5 Feb 1986 | East Hertfordshire | 2 | 2 | Slight |
| Fri 14 Mar 1986 | Welwyn Hatfield | 2 | 1 | Slight |
| Fri 18 Apr 1986 | Welwyn Hatfield | 2 | 1 | Slight |
| Thu 24 Apr 1986 | Welwyn Hatfield | 2 | 1 | Slight |
| Mon 28 Apr 1986 | East Hertfordshire | 3 | 1 | Serious |
| Wed 18 Jun 1986 | Welwyn Hatfield | 2 | 1 | Slight |
| Tue 24 Jun 1986 | Welwyn Hatfield | 2 | 2 | Slight |
| Wed 25 Jun 1986 | East Hertfordshire | 2 | 1 | Slight |
| Wed 6 Aug 1986 | East Hertfordshire | 2 | 1 | Slight |
| Fri 15 Aug 1986 | Welwyn Hatfield | 2 | 1 | Slight |
| Thu 21 Aug 1986 | Welwyn Hatfield | 1 | 1 | Slight |
| Fri 5 Sep 1986 | Welwyn Hatfield | 2 | 1 | Slight |
| Sat 13 Sep 1986 | Welwyn Hatfield | 2 | 1 | Slight |
| Fri 26 Sep 1986 | East Hertfordshire | 2 | 1 | Slight |
| Tue 21 Oct 1986 | Welwyn Hatfield | 2 | 1 | Slight |
| Mon 29 Dec 1986 | East Hertfordshire | 1 | 1 | Slight |
| Wed 31 Dec 1986 | Welwyn Hatfield | 2 | 1 | Slight |