Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Mon 4 Jan 1999 | Harrow | 3 | 1 | Slight |
| Sat 9 Jan 1999 | Harrow | 2 | 2 | Slight |
| Sun 10 Jan 1999 | Harrow | 1 | 1 | Slight |
| Mon 11 Jan 1999 | Harrow | 2 | 2 | Slight |
| Wed 20 Jan 1999 | Harrow | 2 | 1 | Slight |
| Sun 24 Jan 1999 | Brent | 2 | 1 | Slight |
| Sun 24 Jan 1999 | Brent | 2 | 1 | Slight |
| Mon 25 Jan 1999 | Harrow | 1 | 1 | Slight |
| Tue 26 Jan 1999 | Brent | 3 | 2 | Slight |
| Sat 30 Jan 1999 | Hertsmere | 2 | 2 | Slight |
| Mon 1 Feb 1999 | Harrow | 2 | 2 | Slight |
| Mon 8 Feb 1999 | Harrow | 2 | 1 | Slight |
| Fri 12 Feb 1999 | Harrow | 2 | 2 | Slight |
| Sat 20 Feb 1999 | Brent | 1 | 1 | Slight |
| Fri 26 Feb 1999 | Harrow | 2 | 1 | Slight |
| Wed 3 Mar 1999 | Harrow | 1 | 1 | Slight |
| Fri 5 Mar 1999 | Harrow | 2 | 2 | Slight |
| Mon 15 Mar 1999 | Harrow | 2 | 2 | Slight |
| Tue 16 Mar 1999 | Brent | 1 | 1 | Slight |
| Tue 16 Mar 1999 | Brent | 1 | 1 | Slight |
| Fri 19 Mar 1999 | Hertsmere | 1 | 2 | Serious |
| Thu 25 Mar 1999 | Harrow | 1 | 1 | Serious |
| Thu 1 Apr 1999 | Harrow | 1 | 1 | Serious |
| Sun 4 Apr 1999 | Harrow | 1 | 1 | Slight |
| Thu 22 Apr 1999 | Brent | 1 | 1 | Slight |
| Fri 23 Apr 1999 | Harrow | 2 | 1 | Slight |
| Mon 26 Apr 1999 | Brent | 2 | 1 | Slight |
| Wed 28 Apr 1999 | Harrow | 3 | 1 | Slight |
| Fri 30 Apr 1999 | Harrow | 2 | 1 | Slight |
| Sat 1 May 1999 | Harrow | 1 | 1 | Slight |
| Sun 2 May 1999 | Brent | 2 | 2 | Slight |
| Tue 4 May 1999 | Harrow | 2 | 1 | Slight |
| Wed 5 May 1999 | Hertsmere | 2 | 1 | Slight |
| Wed 5 May 1999 | Harrow | 2 | 1 | Serious |
| Sat 15 May 1999 | Harrow | 1 | 1 | Slight |
| Sat 22 May 1999 | Harrow | 2 | 1 | Slight |
| Sun 23 May 1999 | Harrow | 2 | 1 | Slight |
| Sun 23 May 1999 | Harrow | 2 | 1 | Slight |
| Sun 23 May 1999 | Harrow | 2 | 1 | Slight |
| Fri 28 May 1999 | Harrow | 2 | 2 | Slight |
| Fri 28 May 1999 | Harrow | 2 | 1 | Slight |
| Sat 12 Jun 1999 | Harrow | 3 | 1 | Slight |
| Sat 12 Jun 1999 | Brent | 2 | 1 | Slight |
| Tue 15 Jun 1999 | Harrow | 1 | 1 | Fatal |
| Wed 16 Jun 1999 | Harrow | 1 | 1 | Slight |
| Thu 17 Jun 1999 | Harrow | 1 | 1 | Slight |
| Fri 18 Jun 1999 | Harrow | 1 | 1 | Serious |
| Tue 22 Jun 1999 | Harrow | 2 | 2 | Slight |
| Thu 8 Jul 1999 | Harrow | 2 | 2 | Slight |
| Tue 13 Jul 1999 | Harrow | 2 | 2 | Slight |
| Mon 26 Jul 1999 | Harrow | 1 | 1 | Fatal |
| Tue 27 Jul 1999 | Harrow | 2 | 2 | Slight |
| Sun 1 Aug 1999 | Hertsmere | 2 | 1 | Slight |
| Thu 5 Aug 1999 | Hertsmere | 1 | 1 | Slight |
| Tue 10 Aug 1999 | Harrow | 2 | 1 | Slight |
| Fri 13 Aug 1999 | Harrow | 1 | 1 | Slight |
| Sat 14 Aug 1999 | Harrow | 2 | 1 | Slight |
| Sat 14 Aug 1999 | Brent | 2 | 1 | Slight |
| Wed 18 Aug 1999 | Harrow | 2 | 2 | Slight |
| Sat 21 Aug 1999 | Harrow | 2 | 1 | Slight |
| Thu 26 Aug 1999 | Harrow | 2 | 1 | Slight |
| Mon 30 Aug 1999 | Harrow | 1 | 1 | Slight |
| Thu 2 Sep 1999 | Brent | 1 | 1 | Slight |
| Thu 2 Sep 1999 | Brent | 3 | 2 | Slight |
| Fri 3 Sep 1999 | Brent | 2 | 2 | Serious |
| Sun 5 Sep 1999 | Harrow | 1 | 1 | Slight |
| Mon 6 Sep 1999 | Harrow | 1 | 1 | Serious |
| Mon 6 Sep 1999 | Harrow | 1 | 1 | Slight |
| Thu 9 Sep 1999 | Harrow | 1 | 1 | Slight |
| Sat 18 Sep 1999 | Harrow | 4 | 1 | Slight |
| Fri 24 Sep 1999 | Harrow | 2 | 1 | Slight |
| Sun 26 Sep 1999 | Brent | 1 | 1 | Slight |
| Thu 30 Sep 1999 | Harrow | 2 | 2 | Slight |
| Sun 10 Oct 1999 | Harrow | 2 | 3 | Serious |
| Fri 15 Oct 1999 | Harrow | 2 | 1 | Slight |
| Fri 15 Oct 1999 | Harrow | 2 | 1 | Slight |
| Fri 15 Oct 1999 | Hertsmere | 3 | 4 | Slight |
| Sat 16 Oct 1999 | Harrow | 1 | 1 | Serious |
| Sun 17 Oct 1999 | Harrow | 2 | 1 | Slight |
| Tue 19 Oct 1999 | Harrow | 2 | 1 | Slight |
| Wed 20 Oct 1999 | Harrow | 3 | 1 | Slight |
| Thu 21 Oct 1999 | Harrow | 2 | 2 | Slight |
| Sun 31 Oct 1999 | Harrow | 1 | 1 | Slight |
| Mon 1 Nov 1999 | Brent | 3 | 1 | Slight |
| Wed 3 Nov 1999 | Harrow | 2 | 1 | Slight |
| Sat 13 Nov 1999 | Harrow | 2 | 1 | Slight |
| Sat 13 Nov 1999 | Harrow | 2 | 1 | Slight |
| Tue 16 Nov 1999 | Harrow | 2 | 1 | Slight |
| Mon 22 Nov 1999 | Brent | 2 | 1 | Slight |
| Thu 2 Dec 1999 | Brent | 2 | 2 | Slight |
| Sun 5 Dec 1999 | Brent | 1 | 3 | Serious |
| Thu 9 Dec 1999 | Harrow | 2 | 1 | Slight |
| Sat 11 Dec 1999 | Harrow | 2 | 1 | Serious |
| Tue 21 Dec 1999 | Brent | 1 | 1 | Serious |
| Fri 24 Dec 1999 | Brent | 1 | 1 | Serious |
| Fri 31 Dec 1999 | Brent | 1 | 1 | Serious |