Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Sat 2 Jan 1999 | Hillingdon | 2 | 1 | Slight |
| Sun 10 Jan 1999 | Hillingdon | 2 | 1 | Slight |
| Thu 14 Jan 1999 | Hillingdon | 2 | 1 | Slight |
| Fri 15 Jan 1999 | Hillingdon | 1 | 1 | Slight |
| Fri 15 Jan 1999 | Hillingdon | 2 | 1 | Slight |
| Thu 21 Jan 1999 | Hillingdon | 2 | 1 | Slight |
| Wed 27 Jan 1999 | Hillingdon | 2 | 1 | Serious |
| Mon 8 Feb 1999 | Hillingdon | 2 | 1 | Slight |
| Tue 9 Feb 1999 | Hillingdon | 2 | 1 | Slight |
| Fri 19 Feb 1999 | Hillingdon | 2 | 1 | Slight |
| Mon 8 Mar 1999 | Hillingdon | 2 | 1 | Serious |
| Mon 8 Mar 1999 | Hillingdon | 2 | 1 | Serious |
| Sun 14 Mar 1999 | Hillingdon | 1 | 1 | Slight |
| Sun 28 Mar 1999 | Hillingdon | 2 | 1 | Slight |
| Tue 30 Mar 1999 | Hillingdon | 1 | 1 | Slight |
| Tue 30 Mar 1999 | Hillingdon | 1 | 1 | Slight |
| Sat 10 Apr 1999 | Hillingdon | 2 | 4 | Slight |
| Tue 13 Apr 1999 | Hillingdon | 2 | 1 | Slight |
| Wed 14 Apr 1999 | Hillingdon | 2 | 1 | Slight |
| Wed 14 Apr 1999 | Hillingdon | 2 | 1 | Slight |
| Wed 21 Apr 1999 | Hillingdon | 2 | 2 | Serious |
| Thu 22 Apr 1999 | Hillingdon | 2 | 1 | Slight |
| Thu 29 Apr 1999 | Hillingdon | 2 | 1 | Slight |
| Wed 5 May 1999 | Hillingdon | 1 | 1 | Slight |
| Tue 11 May 1999 | Hillingdon | 1 | 1 | Slight |
| Sat 22 May 1999 | Hillingdon | 2 | 3 | Slight |
| Thu 27 May 1999 | Hillingdon | 2 | 1 | Slight |
| Mon 7 Jun 1999 | Hillingdon | 1 | 1 | Slight |
| Wed 9 Jun 1999 | Hillingdon | 2 | 1 | Slight |
| Fri 11 Jun 1999 | Hillingdon | 2 | 2 | Slight |
| Fri 11 Jun 1999 | Hillingdon | 2 | 2 | Slight |
| Tue 29 Jun 1999 | Hillingdon | 2 | 2 | Slight |
| Sun 4 Jul 1999 | Hillingdon | 2 | 1 | Slight |
| Thu 15 Jul 1999 | Hillingdon | 2 | 1 | Slight |
| Sat 17 Jul 1999 | Hillingdon | 2 | 1 | Slight |
| Sat 17 Jul 1999 | Hillingdon | 2 | 2 | Slight |
| Thu 22 Jul 1999 | Hillingdon | 1 | 1 | Slight |
| Tue 3 Aug 1999 | Hillingdon | 2 | 1 | Serious |
| Tue 10 Aug 1999 | Hillingdon | 2 | 1 | Serious |
| Tue 17 Aug 1999 | Hillingdon | 2 | 1 | Fatal |
| Sat 21 Aug 1999 | Hillingdon | 1 | 1 | Slight |
| Tue 31 Aug 1999 | Hillingdon | 2 | 1 | Slight |
| Tue 31 Aug 1999 | Hillingdon | 2 | 1 | Slight |
| Sat 4 Sep 1999 | Hillingdon | 2 | 1 | Slight |
| Tue 7 Sep 1999 | Hillingdon | 1 | 2 | Slight |
| Tue 14 Sep 1999 | Hillingdon | 2 | 1 | Slight |
| Sun 19 Sep 1999 | Hillingdon | 2 | 1 | Serious |
| Mon 27 Sep 1999 | Hillingdon | 1 | 1 | Serious |
| Wed 29 Sep 1999 | Hillingdon | 2 | 1 | Slight |
| Mon 11 Oct 1999 | Hillingdon | 1 | 1 | Slight |
| Mon 11 Oct 1999 | Hillingdon | 1 | 1 | Slight |
| Tue 12 Oct 1999 | Hillingdon | 3 | 1 | Slight |
| Thu 21 Oct 1999 | Hillingdon | 2 | 3 | Serious |
| Thu 21 Oct 1999 | Hillingdon | 2 | 3 | Serious |
| Tue 26 Oct 1999 | Hillingdon | 2 | 1 | Slight |
| Wed 27 Oct 1999 | Hillingdon | 1 | 1 | Slight |
| Fri 29 Oct 1999 | Hillingdon | 3 | 3 | Slight |
| Fri 5 Nov 1999 | Hillingdon | 2 | 2 | Slight |
| Tue 9 Nov 1999 | Hillingdon | 3 | 1 | Slight |
| Wed 17 Nov 1999 | Hillingdon | 2 | 2 | Serious |
| Mon 22 Nov 1999 | Hillingdon | 2 | 1 | Slight |
| Mon 22 Nov 1999 | Hillingdon | 2 | 1 | Slight |
| Mon 22 Nov 1999 | Hillingdon | 1 | 1 | Slight |
| Mon 22 Nov 1999 | Hillingdon | 1 | 1 | Slight |
| Fri 3 Dec 1999 | Hillingdon | 2 | 1 | Slight |
| Tue 7 Dec 1999 | Hillingdon | 1 | 1 | Slight |
| Fri 10 Dec 1999 | Hillingdon | 2 | 1 | Slight |
| Fri 10 Dec 1999 | Hillingdon | 2 | 1 | Slight |
| Sat 11 Dec 1999 | Hillingdon | 2 | 1 | Slight |
| Sat 11 Dec 1999 | Hillingdon | 2 | 1 | Slight |
| Wed 15 Dec 1999 | Hillingdon | 3 | 1 | Slight |
| Fri 17 Dec 1999 | Hillingdon | 2 | 1 | Slight |
| Fri 17 Dec 1999 | Hillingdon | 3 | 1 | Slight |
| Fri 17 Dec 1999 | Hillingdon | 1 | 1 | Slight |