Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Fri 2 Jan 1987 | Watford | 2 | 1 | Slight |
| Sun 4 Jan 1987 | Hertsmere | 2 | 1 | Slight |
| Fri 9 Jan 1987 | Hertsmere | 2 | 2 | Slight |
| Sat 31 Jan 1987 | Harrow | 2 | 1 | Slight |
| Tue 3 Feb 1987 | Watford | 2 | 1 | Slight |
| Fri 6 Feb 1987 | Harrow | 2 | 1 | Serious |
| Thu 12 Feb 1987 | Watford | 1 | 1 | Serious |
| Wed 18 Feb 1987 | Hertsmere | 3 | 2 | Serious |
| Fri 20 Feb 1987 | Harrow | 2 | 1 | Slight |
| Sat 21 Feb 1987 | Harrow | 2 | 1 | Slight |
| Sun 15 Mar 1987 | Harrow | 2 | 1 | Slight |
| Thu 19 Mar 1987 | Harrow | 2 | 1 | Slight |
| Thu 2 Apr 1987 | Watford | 1 | 1 | Slight |
| Thu 2 Apr 1987 | Watford | 1 | 1 | Slight |
| Sun 5 Apr 1987 | Hertsmere | 2 | 1 | Slight |
| Sat 11 Apr 1987 | Watford | 2 | 2 | Slight |
| Sat 11 Apr 1987 | Harrow | 2 | 1 | Slight |
| Wed 29 Apr 1987 | Hertsmere | 1 | 1 | Slight |
| Thu 30 Apr 1987 | Three Rivers | 2 | 1 | Slight |
| Sun 3 May 1987 | Hertsmere | 2 | 1 | Serious |
| Mon 25 May 1987 | Harrow | 2 | 1 | Slight |
| Tue 2 Jun 1987 | Hertsmere | 2 | 1 | Slight |
| Fri 5 Jun 1987 | Hertsmere | 2 | 1 | Slight |
| Tue 16 Jun 1987 | Watford | 1 | 1 | Slight |
| Wed 1 Jul 1987 | Watford | 2 | 1 | Slight |
| Fri 10 Jul 1987 | Hertsmere | 2 | 2 | Slight |
| Wed 22 Jul 1987 | Harrow | 2 | 1 | Slight |
| Sun 26 Jul 1987 | Harrow | 1 | 1 | Slight |
| Sun 2 Aug 1987 | Three Rivers | 2 | 3 | Serious |
| Thu 13 Aug 1987 | Watford | 2 | 5 | Slight |
| Sat 15 Aug 1987 | Watford | 1 | 1 | Slight |
| Sun 16 Aug 1987 | Hertsmere | 1 | 1 | Serious |
| Tue 25 Aug 1987 | Harrow | 2 | 4 | Serious |
| Thu 17 Sep 1987 | Hertsmere | 2 | 1 | Slight |
| Fri 25 Sep 1987 | Harrow | 3 | 1 | Slight |
| Fri 2 Oct 1987 | Harrow | 2 | 1 | Slight |
| Sat 10 Oct 1987 | Hertsmere | 1 | 1 | Slight |
| Fri 16 Oct 1987 | Harrow | 1 | 1 | Slight |
| Sat 31 Oct 1987 | Watford | 2 | 2 | Serious |
| Wed 18 Nov 1987 | Harrow | 2 | 1 | Slight |
| Thu 19 Nov 1987 | Hertsmere | 2 | 1 | Slight |
| Mon 23 Nov 1987 | Harrow | 2 | 1 | Serious |
| Thu 26 Nov 1987 | Hertsmere | 2 | 1 | Slight |
| Tue 8 Dec 1987 | Three Rivers | 3 | 1 | Slight |
| Tue 22 Dec 1987 | Harrow | 3 | 4 | Serious |
| Tue 29 Dec 1987 | Watford | 2 | 1 | Slight |