Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Thu 12 Jan 1989 | Brent | 2 | 1 | Slight |
| Fri 20 Jan 1989 | Harrow | 2 | 1 | Fatal |
| Tue 31 Jan 1989 | Harrow | 2 | 1 | Slight |
| Tue 31 Jan 1989 | Harrow | 2 | 1 | Slight |
| Fri 3 Feb 1989 | Harrow | 1 | 1 | Slight |
| Sat 11 Feb 1989 | Harrow | 1 | 1 | Serious |
| Fri 17 Feb 1989 | Harrow | 2 | 1 | Slight |
| Mon 20 Feb 1989 | Harrow | 2 | 1 | Slight |
| Tue 21 Feb 1989 | Harrow | 2 | 1 | Slight |
| Tue 21 Feb 1989 | Harrow | 2 | 1 | Slight |
| Fri 3 Mar 1989 | Harrow | 2 | 1 | Slight |
| Sat 4 Mar 1989 | Brent | 2 | 1 | Slight |
| Fri 17 Mar 1989 | Harrow | 1 | 1 | Slight |
| Sat 18 Mar 1989 | Brent | 1 | 1 | Slight |
| Sun 26 Mar 1989 | Brent | 2 | 3 | Slight |
| Wed 5 Apr 1989 | Brent | 2 | 1 | Serious |
| Sun 9 Apr 1989 | Harrow | 2 | 1 | Slight |
| Wed 12 Apr 1989 | Harrow | 2 | 1 | Serious |
| Sat 15 Apr 1989 | Harrow | 2 | 1 | Slight |
| Sun 23 Apr 1989 | Harrow | 2 | 1 | Slight |
| Sat 29 Apr 1989 | Harrow | 2 | 1 | Slight |
| Fri 5 May 1989 | Harrow | 2 | 1 | Slight |
| Fri 5 May 1989 | Harrow | 1 | 1 | Slight |
| Mon 22 May 1989 | Brent | 2 | 1 | Slight |
| Mon 29 May 1989 | Hertsmere | 2 | 1 | Slight |
| Sun 4 Jun 1989 | Brent | 2 | 1 | Slight |
| Thu 15 Jun 1989 | Hertsmere | 1 | 1 | Slight |
| Tue 20 Jun 1989 | Harrow | 2 | 1 | Serious |
| Thu 22 Jun 1989 | Hertsmere | 2 | 2 | Slight |
| Sun 25 Jun 1989 | Harrow | 2 | 1 | Slight |
| Wed 28 Jun 1989 | Harrow | 2 | 1 | Slight |
| Fri 30 Jun 1989 | Brent | 3 | 2 | Slight |
| Mon 3 Jul 1989 | Harrow | 2 | 2 | Serious |
| Mon 3 Jul 1989 | Harrow | 2 | 1 | Slight |
| Fri 7 Jul 1989 | Harrow | 2 | 1 | Slight |
| Mon 10 Jul 1989 | Harrow | 2 | 1 | Slight |
| Wed 12 Jul 1989 | Harrow | 2 | 2 | Slight |
| Wed 12 Jul 1989 | Harrow | 2 | 2 | Slight |
| Mon 17 Jul 1989 | Harrow | 2 | 1 | Slight |
| Wed 19 Jul 1989 | Hertsmere | 1 | 3 | Slight |
| Thu 20 Jul 1989 | Harrow | 2 | 1 | Slight |
| Sun 23 Jul 1989 | Harrow | 1 | 1 | Slight |
| Tue 25 Jul 1989 | Harrow | 1 | 1 | Slight |
| Thu 27 Jul 1989 | Brent | 1 | 1 | Slight |
| Wed 2 Aug 1989 | Harrow | 2 | 1 | Slight |
| Thu 3 Aug 1989 | Hertsmere | 2 | 2 | Slight |
| Mon 7 Aug 1989 | Brent | 2 | 1 | Slight |
| Thu 10 Aug 1989 | Harrow | 1 | 1 | Slight |
| Thu 17 Aug 1989 | Harrow | 4 | 5 | Slight |
| Fri 18 Aug 1989 | Harrow | 1 | 1 | Serious |
| Sun 20 Aug 1989 | Brent | 2 | 2 | Slight |
| Sun 27 Aug 1989 | Harrow | 2 | 3 | Serious |
| Wed 30 Aug 1989 | Harrow | 1 | 1 | Slight |
| Tue 12 Sep 1989 | Brent | 2 | 1 | Slight |
| Wed 13 Sep 1989 | Harrow | 2 | 1 | Serious |
| Sat 16 Sep 1989 | Harrow | 1 | 1 | Serious |
| Sun 17 Sep 1989 | Harrow | 1 | 1 | Slight |
| Mon 18 Sep 1989 | Brent | 2 | 1 | Slight |
| Mon 18 Sep 1989 | Harrow | 1 | 1 | Slight |
| Thu 21 Sep 1989 | Harrow | 2 | 1 | Slight |
| Fri 22 Sep 1989 | Brent | 2 | 2 | Slight |
| Fri 22 Sep 1989 | Brent | 2 | 1 | Slight |
| Sun 24 Sep 1989 | Harrow | 2 | 1 | Slight |
| Wed 27 Sep 1989 | Harrow | 3 | 1 | Slight |
| Fri 29 Sep 1989 | Harrow | 2 | 1 | Slight |
| Tue 3 Oct 1989 | Harrow | 2 | 1 | Slight |
| Thu 5 Oct 1989 | Harrow | 2 | 1 | Slight |
| Sat 7 Oct 1989 | Brent | 2 | 1 | Slight |
| Sun 8 Oct 1989 | Harrow | 2 | 1 | Slight |
| Mon 16 Oct 1989 | Brent | 2 | 1 | Slight |
| Mon 16 Oct 1989 | Brent | 2 | 1 | Slight |
| Tue 17 Oct 1989 | Harrow | 2 | 2 | Slight |
| Fri 20 Oct 1989 | Harrow | 2 | 1 | Slight |
| Sun 22 Oct 1989 | Brent | 2 | 1 | Slight |
| Sun 22 Oct 1989 | Brent | 2 | 1 | Slight |
| Sun 22 Oct 1989 | Harrow | 2 | 1 | Slight |
| Mon 23 Oct 1989 | Harrow | 1 | 1 | Slight |
| Wed 1 Nov 1989 | Harrow | 2 | 1 | Slight |
| Mon 6 Nov 1989 | Harrow | 2 | 1 | Slight |
| Mon 13 Nov 1989 | Harrow | 2 | 1 | Slight |
| Tue 14 Nov 1989 | Harrow | 1 | 1 | Slight |
| Sat 25 Nov 1989 | Harrow | 1 | 1 | Serious |
| Thu 30 Nov 1989 | Harrow | 2 | 1 | Slight |
| Sun 3 Dec 1989 | Harrow | 2 | 1 | Slight |
| Mon 4 Dec 1989 | Hertsmere | 3 | 3 | Serious |
| Tue 5 Dec 1989 | Harrow | 1 | 1 | Slight |
| Thu 14 Dec 1989 | Harrow | 2 | 1 | Slight |
| Sat 16 Dec 1989 | Harrow | 2 | 1 | Slight |
| Tue 19 Dec 1989 | Harrow | 1 | 1 | Serious |
| Tue 19 Dec 1989 | Harrow | 2 | 2 | Slight |
| Tue 19 Dec 1989 | Harrow | 2 | 1 | Serious |
| Tue 19 Dec 1989 | Harrow | 1 | 2 | Slight |
| Sun 24 Dec 1989 | Hertsmere | 2 | 1 | Slight |