Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Mon 1 Jan 1990 | Harrow | 1 | 1 | Slight |
| Wed 3 Jan 1990 | Harrow | 2 | 1 | Slight |
| Sat 6 Jan 1990 | Hertsmere | 1 | 1 | Slight |
| Sat 6 Jan 1990 | Brent | 2 | 1 | Slight |
| Sat 6 Jan 1990 | Hertsmere | 2 | 1 | Slight |
| Sun 7 Jan 1990 | Brent | 2 | 2 | Serious |
| Mon 8 Jan 1990 | Hertsmere | 2 | 1 | Slight |
| Mon 8 Jan 1990 | Harrow | 1 | 1 | Fatal |
| Fri 12 Jan 1990 | Brent | 2 | 1 | Slight |
| Fri 12 Jan 1990 | Harrow | 1 | 1 | Slight |
| Sat 13 Jan 1990 | Harrow | 2 | 1 | Slight |
| Sat 13 Jan 1990 | Harrow | 2 | 1 | Slight |
| Mon 15 Jan 1990 | Harrow | 2 | 1 | Slight |
| Tue 16 Jan 1990 | Harrow | 3 | 1 | Slight |
| Tue 23 Jan 1990 | Harrow | 2 | 2 | Slight |
| Sat 27 Jan 1990 | Hertsmere | 2 | 1 | Slight |
| Sun 28 Jan 1990 | Hertsmere | 2 | 1 | Slight |
| Mon 29 Jan 1990 | Harrow | 2 | 2 | Slight |
| Wed 21 Feb 1990 | Harrow | 2 | 3 | Serious |
| Thu 22 Feb 1990 | Harrow | 1 | 2 | Serious |
| Thu 22 Feb 1990 | Harrow | 1 | 2 | Serious |
| Mon 26 Feb 1990 | Brent | 4 | 1 | Slight |
| Sat 10 Mar 1990 | Brent | 1 | 1 | Slight |
| Mon 19 Mar 1990 | Harrow | 2 | 1 | Slight |
| Sat 24 Mar 1990 | Brent | 2 | 1 | Slight |
| Sun 25 Mar 1990 | Harrow | 1 | 2 | Serious |
| Sun 1 Apr 1990 | Harrow | 2 | 1 | Slight |
| Thu 5 Apr 1990 | Hertsmere | 1 | 1 | Slight |
| Fri 6 Apr 1990 | Harrow | 2 | 2 | Serious |
| Mon 23 Apr 1990 | Brent | 2 | 1 | Slight |
| Sat 5 May 1990 | Hertsmere | 3 | 2 | Slight |
| Mon 7 May 1990 | Hertsmere | 3 | 2 | Slight |
| Wed 16 May 1990 | Harrow | 2 | 2 | Slight |
| Wed 16 May 1990 | Harrow | 2 | 2 | Slight |
| Fri 18 May 1990 | Hertsmere | 1 | 6 | Slight |
| Sun 20 May 1990 | Harrow | 2 | 1 | Slight |
| Tue 5 Jun 1990 | Harrow | 1 | 1 | Serious |
| Fri 8 Jun 1990 | Harrow | 2 | 1 | Slight |
| Sat 9 Jun 1990 | Harrow | 2 | 1 | Serious |
| Tue 19 Jun 1990 | Harrow | 2 | 1 | Slight |
| Thu 21 Jun 1990 | Harrow | 2 | 1 | Slight |
| Tue 10 Jul 1990 | Harrow | 2 | 1 | Serious |
| Fri 20 Jul 1990 | Brent | 1 | 1 | Slight |
| Wed 25 Jul 1990 | Hertsmere | 2 | 1 | Slight |
| Fri 27 Jul 1990 | Harrow | 1 | 2 | Slight |
| Sun 29 Jul 1990 | Harrow | 2 | 1 | Slight |
| Tue 31 Jul 1990 | Harrow | 1 | 1 | Slight |
| Wed 1 Aug 1990 | Harrow | 3 | 1 | Serious |
| Sun 5 Aug 1990 | Brent | 2 | 1 | Slight |
| Fri 10 Aug 1990 | Harrow | 1 | 1 | Slight |
| Tue 14 Aug 1990 | Harrow | 3 | 2 | Slight |
| Fri 17 Aug 1990 | Harrow | 2 | 1 | Serious |
| Mon 20 Aug 1990 | Harrow | 2 | 1 | Slight |
| Wed 22 Aug 1990 | Harrow | 2 | 2 | Slight |
| Wed 22 Aug 1990 | Harrow | 2 | 1 | Slight |
| Wed 22 Aug 1990 | Harrow | 1 | 1 | Slight |
| Thu 6 Sep 1990 | Hertsmere | 2 | 1 | Slight |
| Fri 14 Sep 1990 | Hertsmere | 3 | 2 | Serious |
| Sun 16 Sep 1990 | Hertsmere | 2 | 1 | Slight |
| Fri 28 Sep 1990 | Harrow | 2 | 2 | Serious |
| Sun 30 Sep 1990 | Harrow | 2 | 1 | Slight |
| Tue 2 Oct 1990 | Harrow | 2 | 1 | Serious |
| Wed 3 Oct 1990 | Harrow | 1 | 4 | Serious |
| Fri 5 Oct 1990 | Hertsmere | 2 | 1 | Slight |
| Fri 5 Oct 1990 | Harrow | 2 | 1 | Slight |
| Sun 7 Oct 1990 | Brent | 1 | 1 | Serious |
| Mon 15 Oct 1990 | Harrow | 3 | 1 | Slight |
| Sat 20 Oct 1990 | Brent | 1 | 1 | Slight |
| Fri 2 Nov 1990 | Harrow | 2 | 1 | Slight |
| Wed 7 Nov 1990 | Harrow | 1 | 1 | Serious |
| Fri 9 Nov 1990 | Brent | 2 | 1 | Slight |
| Fri 9 Nov 1990 | Harrow | 2 | 1 | Serious |
| Sat 10 Nov 1990 | Brent | 3 | 3 | Slight |
| Sat 10 Nov 1990 | Harrow | 3 | 1 | Slight |
| Fri 16 Nov 1990 | Harrow | 2 | 1 | Slight |
| Sat 17 Nov 1990 | Harrow | 4 | 3 | Slight |
| Fri 23 Nov 1990 | Brent | 2 | 1 | Slight |
| Fri 23 Nov 1990 | Harrow | 1 | 1 | Slight |
| Fri 23 Nov 1990 | Harrow | 2 | 1 | Slight |
| Tue 27 Nov 1990 | Harrow | 1 | 1 | Slight |
| Sun 9 Dec 1990 | Harrow | 2 | 1 | Slight |
| Wed 12 Dec 1990 | Harrow | 1 | 1 | Serious |
| Thu 20 Dec 1990 | Harrow | 2 | 1 | Slight |
| Fri 21 Dec 1990 | Harrow | 1 | 1 | Slight |
| Sat 29 Dec 1990 | Harrow | 2 | 1 | Slight |