Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Fri 1 Jan 1999 | Hillingdon | 1 | 1 | Slight |
| Fri 15 Jan 1999 | Hillingdon | 2 | 1 | Slight |
| Fri 15 Jan 1999 | Hillingdon | 3 | 1 | Slight |
| Mon 18 Jan 1999 | Hillingdon | 2 | 1 | Slight |
| Mon 18 Jan 1999 | Hillingdon | 2 | 1 | Slight |
| Tue 19 Jan 1999 | Hillingdon | 6 | 4 | Slight |
| Sun 24 Jan 1999 | Hillingdon | 2 | 2 | Slight |
| Sun 24 Jan 1999 | Hillingdon | 2 | 2 | Slight |
| Tue 2 Feb 1999 | Hillingdon | 2 | 1 | Slight |
| Tue 2 Feb 1999 | Hillingdon | 2 | 1 | Slight |
| Tue 16 Feb 1999 | Hillingdon | 3 | 2 | Serious |
| Sat 20 Feb 1999 | Hillingdon | 1 | 1 | Fatal |
| Sat 20 Feb 1999 | Hillingdon | 2 | 1 | Serious |
| Fri 26 Feb 1999 | Harrow | 2 | 2 | Slight |
| Sun 21 Mar 1999 | Hillingdon | 2 | 4 | Serious |
| Sun 11 Apr 1999 | Harrow | 2 | 1 | Slight |
| Thu 15 Apr 1999 | Harrow | 2 | 1 | Slight |
| Thu 15 Apr 1999 | Hillingdon | 1 | 2 | Slight |
| Sat 17 Apr 1999 | Hillingdon | 2 | 1 | Slight |
| Mon 19 Apr 1999 | Hillingdon | 2 | 1 | Slight |
| Tue 4 May 1999 | Hillingdon | 2 | 1 | Slight |
| Sat 22 May 1999 | Hillingdon | 2 | 2 | Slight |
| Thu 10 Jun 1999 | Hillingdon | 2 | 1 | Slight |
| Sun 13 Jun 1999 | Hillingdon | 2 | 2 | Slight |
| Wed 16 Jun 1999 | Hillingdon | 2 | 1 | Serious |
| Sun 20 Jun 1999 | Hillingdon | 2 | 2 | Slight |
| Wed 23 Jun 1999 | Hillingdon | 2 | 2 | Slight |
| Sat 24 Jul 1999 | Hillingdon | 3 | 1 | Slight |
| Mon 26 Jul 1999 | Hillingdon | 2 | 1 | Slight |
| Wed 28 Jul 1999 | Hillingdon | 2 | 1 | Slight |
| Wed 11 Aug 1999 | Hillingdon | 2 | 1 | Slight |
| Fri 20 Aug 1999 | Hillingdon | 1 | 1 | Slight |
| Tue 14 Sep 1999 | Hillingdon | 2 | 1 | Slight |
| Tue 28 Sep 1999 | Hillingdon | 2 | 1 | Slight |
| Tue 28 Sep 1999 | Hillingdon | 2 | 1 | Slight |
| Thu 30 Sep 1999 | Hillingdon | 2 | 1 | Slight |
| Thu 30 Sep 1999 | Hillingdon | 2 | 1 | Slight |
| Thu 30 Sep 1999 | Hillingdon | 2 | 1 | Slight |
| Thu 30 Sep 1999 | Hillingdon | 2 | 1 | Slight |
| Thu 7 Oct 1999 | Hillingdon | 2 | 1 | Slight |
| Thu 21 Oct 1999 | Hillingdon | 2 | 1 | Slight |
| Mon 25 Oct 1999 | Hillingdon | 2 | 1 | Slight |
| Fri 29 Oct 1999 | Hillingdon | 2 | 1 | Slight |
| Mon 8 Nov 1999 | Hillingdon | 2 | 1 | Serious |
| Fri 12 Nov 1999 | Hillingdon | 1 | 1 | Slight |
| Thu 18 Nov 1999 | Hillingdon | 2 | 1 | Slight |
| Tue 23 Nov 1999 | Hillingdon | 2 | 1 | Slight |
| Thu 9 Dec 1999 | Hillingdon | 2 | 1 | Slight |
| Fri 17 Dec 1999 | Hillingdon | 2 | 1 | Slight |
| Wed 22 Dec 1999 | Hillingdon | 1 | 1 | Slight |