Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Sat 7 Jan 1989 | Barnet | 2 | 1 | Slight |
| Mon 23 Jan 1989 | Harrow | 2 | 1 | Slight |
| Thu 26 Jan 1989 | Harrow | 3 | 1 | Slight |
| Sat 28 Jan 1989 | Harrow | 2 | 2 | Slight |
| Sat 28 Jan 1989 | Harrow | 1 | 1 | Slight |
| Sun 5 Feb 1989 | Barnet | 2 | 1 | Slight |
| Mon 13 Feb 1989 | Harrow | 2 | 2 | Slight |
| Fri 17 Feb 1989 | Harrow | 1 | 1 | Slight |
| Fri 24 Feb 1989 | Harrow | 3 | 1 | Slight |
| Fri 24 Feb 1989 | Harrow | 2 | 1 | Slight |
| Thu 2 Mar 1989 | Harrow | 2 | 1 | Slight |
| Fri 3 Mar 1989 | Harrow | 2 | 1 | Slight |
| Fri 3 Mar 1989 | Harrow | 2 | 1 | Slight |
| Wed 8 Mar 1989 | Harrow | 2 | 1 | Slight |
| Fri 10 Mar 1989 | Harrow | 2 | 1 | Slight |
| Sat 18 Mar 1989 | Harrow | 2 | 1 | Slight |
| Tue 21 Mar 1989 | Harrow | 1 | 1 | Slight |
| Thu 6 Apr 1989 | Harrow | 4 | 2 | Slight |
| Fri 14 Apr 1989 | Harrow | 2 | 1 | Slight |
| Mon 17 Apr 1989 | Harrow | 2 | 1 | Serious |
| Tue 2 May 1989 | Harrow | 2 | 1 | Slight |
| Fri 5 May 1989 | Harrow | 1 | 1 | Slight |
| Sat 6 May 1989 | Harrow | 2 | 1 | Slight |
| Tue 9 May 1989 | Harrow | 2 | 1 | Slight |
| Tue 9 May 1989 | Harrow | 2 | 1 | Slight |
| Mon 22 May 1989 | Barnet | 2 | 1 | Serious |
| Wed 24 May 1989 | Harrow | 1 | 1 | Slight |
| Sat 3 Jun 1989 | Harrow | 2 | 1 | Slight |
| Mon 19 Jun 1989 | Harrow | 1 | 1 | Slight |
| Thu 22 Jun 1989 | Harrow | 1 | 1 | Slight |
| Fri 30 Jun 1989 | Harrow | 2 | 1 | Serious |
| Mon 3 Jul 1989 | Harrow | 3 | 3 | Slight |
| Fri 7 Jul 1989 | Harrow | 2 | 1 | Slight |
| Mon 10 Jul 1989 | Harrow | 2 | 1 | Slight |
| Sat 15 Jul 1989 | Harrow | 2 | 1 | Slight |
| Mon 17 Jul 1989 | Harrow | 2 | 1 | Slight |
| Wed 19 Jul 1989 | Harrow | 2 | 1 | Slight |
| Fri 21 Jul 1989 | Harrow | 2 | 1 | Slight |
| Sat 22 Jul 1989 | Harrow | 2 | 1 | Slight |
| Mon 24 Jul 1989 | Harrow | 1 | 2 | Slight |
| Sat 29 Jul 1989 | Harrow | 1 | 1 | Slight |
| Wed 2 Aug 1989 | Harrow | 2 | 1 | Slight |
| Tue 15 Aug 1989 | Harrow | 2 | 1 | Slight |
| Wed 23 Aug 1989 | Harrow | 2 | 1 | Slight |
| Fri 1 Sep 1989 | Barnet | 2 | 2 | Serious |
| Mon 4 Sep 1989 | Harrow | 2 | 1 | Slight |
| Thu 7 Sep 1989 | Harrow | 2 | 1 | Slight |
| Tue 12 Sep 1989 | Harrow | 2 | 1 | Slight |
| Wed 13 Sep 1989 | Harrow | 2 | 1 | Serious |
| Thu 14 Sep 1989 | Harrow | 2 | 2 | Slight |
| Sat 16 Sep 1989 | Barnet | 2 | 1 | Slight |
| Sat 16 Sep 1989 | Harrow | 1 | 1 | Slight |
| Fri 22 Sep 1989 | Harrow | 2 | 1 | Slight |
| Fri 29 Sep 1989 | Harrow | 1 | 1 | Slight |
| Sat 30 Sep 1989 | Harrow | 1 | 1 | Slight |
| Mon 2 Oct 1989 | Harrow | 2 | 1 | Slight |
| Tue 3 Oct 1989 | Harrow | 2 | 1 | Slight |
| Thu 12 Oct 1989 | Harrow | 2 | 1 | Slight |
| Thu 19 Oct 1989 | Harrow | 2 | 1 | Slight |
| Fri 20 Oct 1989 | Barnet | 1 | 1 | Serious |
| Sat 21 Oct 1989 | Harrow | 2 | 1 | Slight |
| Thu 26 Oct 1989 | Harrow | 2 | 1 | Slight |
| Fri 27 Oct 1989 | Harrow | 1 | 1 | Slight |
| Sat 28 Oct 1989 | Harrow | 1 | 1 | Serious |
| Thu 2 Nov 1989 | Harrow | 2 | 1 | Slight |
| Tue 7 Nov 1989 | Harrow | 2 | 1 | Slight |
| Sat 11 Nov 1989 | Harrow | 1 | 1 | Slight |
| Sun 12 Nov 1989 | Harrow | 2 | 2 | Slight |
| Sat 18 Nov 1989 | Barnet | 2 | 1 | Slight |
| Thu 23 Nov 1989 | Harrow | 2 | 1 | Slight |
| Sat 25 Nov 1989 | Harrow | 1 | 1 | Serious |
| Mon 27 Nov 1989 | Harrow | 2 | 1 | Slight |
| Tue 28 Nov 1989 | Harrow | 2 | 2 | Slight |
| Sat 2 Dec 1989 | Harrow | 1 | 2 | Serious |
| Tue 5 Dec 1989 | Harrow | 2 | 1 | Slight |
| Fri 8 Dec 1989 | Harrow | 2 | 1 | Slight |
| Sat 9 Dec 1989 | Harrow | 2 | 2 | Slight |
| Mon 11 Dec 1989 | Harrow | 2 | 1 | Slight |
| Wed 13 Dec 1989 | Harrow | 2 | 2 | Serious |
| Sat 16 Dec 1989 | Harrow | 1 | 1 | Serious |
| Tue 19 Dec 1989 | Harrow | 2 | 1 | Slight |