Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Sun 5 Jan 1986 | Three Rivers | 1 | 1 | Slight |
| Wed 15 Jan 1986 | Three Rivers | 2 | 1 | Slight |
| Wed 22 Jan 1986 | Three Rivers | 4 | 3 | Slight |
| Fri 24 Jan 1986 | Watford | 2 | 2 | Slight |
| Wed 5 Feb 1986 | Three Rivers | 1 | 1 | Slight |
| Sun 2 Mar 1986 | Three Rivers | 1 | 1 | Serious |
| Mon 10 Mar 1986 | Three Rivers | 2 | 2 | Slight |
| Tue 18 Mar 1986 | Three Rivers | 1 | 1 | Slight |
| Sat 22 Mar 1986 | Three Rivers | 2 | 1 | Slight |
| Tue 25 Mar 1986 | Three Rivers | 2 | 1 | Slight |
| Fri 28 Mar 1986 | Three Rivers | 3 | 1 | Slight |
| Fri 9 May 1986 | Watford | 2 | 2 | Serious |
| Sat 24 May 1986 | Three Rivers | 1 | 1 | Serious |
| Sun 8 Jun 1986 | Watford | 2 | 1 | Slight |
| Mon 21 Jul 1986 | Three Rivers | 1 | 1 | Slight |
| Wed 30 Jul 1986 | Three Rivers | 1 | 1 | Slight |
| Sat 9 Aug 1986 | Watford | 2 | 1 | Slight |
| Fri 22 Aug 1986 | Watford | 1 | 1 | Slight |
| Tue 26 Aug 1986 | Three Rivers | 2 | 1 | Slight |
| Sun 28 Sep 1986 | Three Rivers | 2 | 1 | Slight |
| Mon 6 Oct 1986 | Three Rivers | 2 | 2 | Serious |
| Thu 9 Oct 1986 | Three Rivers | 2 | 2 | Slight |
| Fri 10 Oct 1986 | Watford | 3 | 1 | Slight |
| Fri 17 Oct 1986 | Three Rivers | 1 | 2 | Slight |
| Thu 13 Nov 1986 | Three Rivers | 3 | 2 | Slight |
| Wed 19 Nov 1986 | Watford | 2 | 1 | Slight |
| Sun 30 Nov 1986 | Three Rivers | 1 | 1 | Slight |
| Thu 4 Dec 1986 | Three Rivers | 3 | 1 | Slight |
| Fri 26 Dec 1986 | Watford | 1 | 1 | Serious |