Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Tue 6 Jan 1998 | Hillingdon | 1 | 1 | Slight |
| Tue 6 Jan 1998 | Hillingdon | 1 | 1 | Slight |
| Wed 7 Jan 1998 | Hillingdon | 2 | 1 | Slight |
| Fri 9 Jan 1998 | Hillingdon | 2 | 1 | Serious |
| Sun 11 Jan 1998 | Hillingdon | 2 | 1 | Slight |
| Mon 12 Jan 1998 | Hillingdon | 2 | 3 | Slight |
| Sat 17 Jan 1998 | Hillingdon | 2 | 1 | Slight |
| Sat 17 Jan 1998 | Hillingdon | 2 | 1 | Slight |
| Sat 17 Jan 1998 | Hillingdon | 2 | 2 | Slight |
| Tue 27 Jan 1998 | Hillingdon | 2 | 1 | Slight |
| Tue 27 Jan 1998 | Hillingdon | 2 | 2 | Serious |
| Fri 30 Jan 1998 | Hillingdon | 3 | 1 | Slight |
| Tue 3 Feb 1998 | Hillingdon | 2 | 2 | Slight |
| Tue 3 Feb 1998 | Hillingdon | 2 | 2 | Slight |
| Tue 3 Feb 1998 | Hillingdon | 1 | 1 | Serious |
| Thu 5 Feb 1998 | South Somerset | 3 | 1 | Slight |
| Sat 7 Feb 1998 | Hillingdon | 2 | 1 | Slight |
| Sun 8 Feb 1998 | Hillingdon | 2 | 1 | Slight |
| Sun 8 Feb 1998 | Hillingdon | 2 | 1 | Slight |
| Sat 14 Feb 1998 | Hillingdon | 2 | 1 | Slight |
| Mon 16 Feb 1998 | Hillingdon | 2 | 1 | Slight |
| Mon 16 Feb 1998 | Hillingdon | 2 | 1 | Slight |
| Thu 19 Feb 1998 | Hillingdon | 1 | 1 | Serious |
| Tue 24 Feb 1998 | Hillingdon | 2 | 1 | Slight |
| Tue 24 Feb 1998 | Hillingdon | 2 | 1 | Slight |
| Fri 27 Feb 1998 | Hillingdon | 2 | 1 | Slight |
| Fri 6 Mar 1998 | Hillingdon | 2 | 1 | Serious |
| Fri 6 Mar 1998 | Hillingdon | 2 | 1 | Serious |
| Sat 7 Mar 1998 | Hillingdon | 2 | 1 | Slight |
| Tue 10 Mar 1998 | Hillingdon | 2 | 1 | Serious |
| Fri 13 Mar 1998 | Hillingdon | 2 | 1 | Slight |
| Sat 14 Mar 1998 | Hillingdon | 2 | 1 | Slight |
| Sat 14 Mar 1998 | Hillingdon | 2 | 1 | Slight |
| Wed 18 Mar 1998 | Hillingdon | 2 | 1 | Slight |
| Sat 21 Mar 1998 | Hillingdon | 3 | 2 | Slight |
| Sat 21 Mar 1998 | Hillingdon | 3 | 2 | Slight |
| Tue 24 Mar 1998 | Hillingdon | 2 | 1 | Serious |
| Tue 24 Mar 1998 | Hillingdon | 2 | 1 | Serious |
| Tue 24 Mar 1998 | Hillingdon | 2 | 1 | Slight |
| Tue 24 Mar 1998 | Hillingdon | 2 | 1 | Slight |
| Thu 26 Mar 1998 | Hillingdon | 2 | 1 | Serious |
| Thu 26 Mar 1998 | Hillingdon | 2 | 1 | Serious |
| Thu 26 Mar 1998 | Hillingdon | 2 | 1 | Slight |
| Mon 30 Mar 1998 | Hillingdon | 2 | 1 | Slight |
| Fri 3 Apr 1998 | Hillingdon | 2 | 1 | Slight |
| Wed 8 Apr 1998 | Hillingdon | 1 | 1 | Serious |
| Thu 16 Apr 1998 | Hillingdon | 2 | 1 | Slight |
| Fri 17 Apr 1998 | Hillingdon | 2 | 1 | Slight |
| Sun 19 Apr 1998 | Hillingdon | 2 | 1 | Slight |
| Mon 20 Apr 1998 | Hillingdon | 1 | 1 | Slight |
| Mon 27 Apr 1998 | Hillingdon | 2 | 1 | Slight |
| Fri 1 May 1998 | Hillingdon | 2 | 1 | Slight |
| Sun 10 May 1998 | Hillingdon | 2 | 2 | Slight |
| Sun 10 May 1998 | Hillingdon | 2 | 2 | Slight |
| Sun 10 May 1998 | Hillingdon | 2 | 1 | Slight |
| Tue 12 May 1998 | Hillingdon | 2 | 1 | Serious |
| Tue 12 May 1998 | Hillingdon | 2 | 1 | Slight |
| Tue 19 May 1998 | Hillingdon | 1 | 1 | Serious |
| Thu 21 May 1998 | Hillingdon | 2 | 1 | Serious |
| Thu 28 May 1998 | Hillingdon | 2 | 1 | Slight |
| Thu 28 May 1998 | Hillingdon | 2 | 1 | Slight |
| Fri 5 Jun 1998 | Hillingdon | 2 | 3 | Slight |
| Tue 9 Jun 1998 | Hillingdon | 3 | 1 | Serious |
| Tue 9 Jun 1998 | Hillingdon | 2 | 1 | Slight |
| Wed 10 Jun 1998 | Hillingdon | 2 | 1 | Slight |
| Wed 10 Jun 1998 | Hillingdon | 2 | 1 | Slight |
| Wed 17 Jun 1998 | Hillingdon | 2 | 2 | Serious |
| Thu 18 Jun 1998 | Hillingdon | 2 | 1 | Slight |
| Thu 18 Jun 1998 | Hillingdon | 2 | 1 | Slight |
| Fri 19 Jun 1998 | Hillingdon | 2 | 1 | Slight |
| Sat 20 Jun 1998 | Hillingdon | 2 | 1 | Slight |
| Sun 21 Jun 1998 | Hillingdon | 2 | 1 | Slight |
| Sun 21 Jun 1998 | Hillingdon | 2 | 1 | Slight |
| Sat 27 Jun 1998 | Hillingdon | 2 | 1 | Slight |
| Thu 2 Jul 1998 | Hillingdon | 1 | 1 | Slight |
| Tue 7 Jul 1998 | Hillingdon | 2 | 2 | Serious |
| Tue 7 Jul 1998 | Hillingdon | 2 | 2 | Serious |
| Tue 7 Jul 1998 | Hillingdon | 2 | 1 | Slight |
| Wed 8 Jul 1998 | Hillingdon | 3 | 1 | Slight |
| Wed 8 Jul 1998 | Hillingdon | 2 | 1 | Slight |
| Wed 8 Jul 1998 | Hillingdon | 2 | 1 | Slight |
| Mon 13 Jul 1998 | Hillingdon | 2 | 1 | Slight |
| Thu 16 Jul 1998 | Hillingdon | 2 | 1 | Serious |
| Sat 25 Jul 1998 | Hillingdon | 1 | 1 | Slight |
| Thu 30 Jul 1998 | Hillingdon | 2 | 1 | Slight |
| Fri 31 Jul 1998 | Hillingdon | 2 | 1 | Serious |
| Fri 31 Jul 1998 | Hillingdon | 2 | 1 | Serious |
| Mon 10 Aug 1998 | Hillingdon | 1 | 2 | Serious |
| Mon 10 Aug 1998 | Hillingdon | 2 | 1 | Slight |
| Mon 10 Aug 1998 | Hillingdon | 3 | 5 | Serious |
| Sun 16 Aug 1998 | Hillingdon | 2 | 1 | Slight |
| Mon 17 Aug 1998 | Hillingdon | 1 | 2 | Slight |
| Mon 17 Aug 1998 | Hillingdon | 2 | 1 | Slight |
| Fri 21 Aug 1998 | Hillingdon | 2 | 2 | Fatal |
| Mon 24 Aug 1998 | Hillingdon | 2 | 2 | Slight |
| Thu 3 Sep 1998 | Hillingdon | 2 | 1 | Slight |
| Sun 6 Sep 1998 | Hillingdon | 2 | 1 | Slight |
| Tue 8 Sep 1998 | Hillingdon | 2 | 1 | Serious |
| Fri 11 Sep 1998 | Hillingdon | 1 | 1 | Serious |
| Sat 12 Sep 1998 | Hillingdon | 2 | 2 | Slight |
| Sun 13 Sep 1998 | Hillingdon | 1 | 1 | Serious |
| Mon 14 Sep 1998 | Hillingdon | 2 | 1 | Slight |
| Fri 18 Sep 1998 | Hillingdon | 1 | 1 | Slight |
| Mon 28 Sep 1998 | Hillingdon | 2 | 1 | Slight |
| Wed 30 Sep 1998 | Hillingdon | 2 | 1 | Serious |
| Tue 6 Oct 1998 | Hillingdon | 1 | 1 | Slight |
| Thu 15 Oct 1998 | Hillingdon | 1 | 1 | Slight |
| Sun 18 Oct 1998 | Hillingdon | 1 | 1 | Slight |
| Sun 18 Oct 1998 | Hillingdon | 1 | 1 | Slight |
| Tue 20 Oct 1998 | Hillingdon | 1 | 1 | Slight |
| Mon 26 Oct 1998 | Hillingdon | 1 | 1 | Serious |
| Wed 4 Nov 1998 | Hillingdon | 2 | 1 | Slight |
| Wed 11 Nov 1998 | Hillingdon | 2 | 3 | Slight |
| Thu 12 Nov 1998 | Hillingdon | 2 | 1 | Slight |
| Tue 17 Nov 1998 | Hillingdon | 2 | 1 | Slight |
| Wed 18 Nov 1998 | Hillingdon | 2 | 2 | Slight |
| Mon 23 Nov 1998 | Hillingdon | 3 | 1 | Slight |
| Fri 27 Nov 1998 | Hillingdon | 2 | 1 | Slight |
| Fri 27 Nov 1998 | Hillingdon | 2 | 1 | Slight |
| Sat 28 Nov 1998 | Hillingdon | 1 | 1 | Slight |
| Sun 29 Nov 1998 | Hillingdon | 2 | 1 | Slight |
| Mon 30 Nov 1998 | Hillingdon | 2 | 1 | Slight |
| Mon 30 Nov 1998 | Hillingdon | 2 | 1 | Slight |
| Thu 3 Dec 1998 | Hillingdon | 2 | 1 | Slight |
| Tue 15 Dec 1998 | Hillingdon | 2 | 1 | Slight |
| Tue 15 Dec 1998 | Hillingdon | 2 | 1 | Slight |
| Wed 16 Dec 1998 | Hillingdon | 2 | 1 | Slight |
| Thu 17 Dec 1998 | Hillingdon | 3 | 1 | Slight |
| Mon 21 Dec 1998 | Hillingdon | 2 | 1 | Serious |
| Mon 21 Dec 1998 | Hillingdon | 2 | 1 | Slight |