Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Fri 2 Jan 1998 | Welwyn Hatfield | 3 | 3 | Slight |
| Sat 3 Jan 1998 | Hertsmere | 2 | 2 | Slight |
| Mon 5 Jan 1998 | Barnet | 2 | 1 | Slight |
| Wed 7 Jan 1998 | Hertsmere | 1 | 1 | Slight |
| Fri 9 Jan 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Sat 10 Jan 1998 | Welwyn Hatfield | 2 | 1 | Serious |
| Mon 12 Jan 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Sun 18 Jan 1998 | Barnet | 1 | 1 | Slight |
| Wed 21 Jan 1998 | Barnet | 2 | 1 | Slight |
| Thu 22 Jan 1998 | Barnet | 4 | 1 | Slight |
| Mon 26 Jan 1998 | Haringey | 2 | 1 | Slight |
| Mon 26 Jan 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Thu 29 Jan 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Sat 31 Jan 1998 | Barnet | 2 | 1 | Slight |
| Sun 1 Feb 1998 | Barnet | 2 | 1 | Slight |
| Mon 2 Feb 1998 | Barnet | 2 | 1 | Slight |
| Wed 4 Feb 1998 | Barnet | 1 | 1 | Slight |
| Wed 4 Feb 1998 | Barnet | 1 | 1 | Slight |
| Fri 6 Feb 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Fri 6 Feb 1998 | Barnet | 2 | 1 | Slight |
| Sat 7 Feb 1998 | Welwyn Hatfield | 3 | 1 | Slight |
| Sat 7 Feb 1998 | Barnet | 1 | 1 | Serious |
| Sat 7 Feb 1998 | Barnet | 2 | 1 | Slight |
| Sat 7 Feb 1998 | Hertsmere | 1 | 1 | Serious |
| Tue 10 Feb 1998 | Barnet | 1 | 1 | Slight |
| Wed 11 Feb 1998 | Welwyn Hatfield | 2 | 3 | Serious |
| Sun 15 Feb 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Mon 16 Feb 1998 | Barnet | 2 | 1 | Serious |
| Tue 17 Feb 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Tue 17 Feb 1998 | Welwyn Hatfield | 3 | 3 | Serious |
| Tue 17 Feb 1998 | Barnet | 2 | 1 | Slight |
| Tue 17 Feb 1998 | Barnet | 2 | 1 | Slight |
| Tue 17 Feb 1998 | Barnet | 2 | 1 | Slight |
| Fri 20 Feb 1998 | Barnet | 2 | 1 | Slight |
| Fri 20 Feb 1998 | Barnet | 2 | 1 | Slight |
| Fri 20 Feb 1998 | Barnet | 2 | 1 | Slight |
| Fri 20 Feb 1998 | Barnet | 2 | 2 | Slight |
| Sat 21 Feb 1998 | Hertsmere | 1 | 1 | Slight |
| Fri 27 Feb 1998 | Barnet | 2 | 1 | Slight |
| Mon 2 Mar 1998 | Barnet | 1 | 1 | Slight |
| Mon 2 Mar 1998 | Welwyn Hatfield | 3 | 2 | Slight |
| Mon 2 Mar 1998 | Barnet | 1 | 1 | Slight |
| Wed 4 Mar 1998 | Barnet | 2 | 1 | Slight |
| Thu 5 Mar 1998 | Barnet | 2 | 1 | Slight |
| Fri 6 Mar 1998 | Barnet | 2 | 1 | Slight |
| Sat 7 Mar 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Mon 9 Mar 1998 | Barnet | 1 | 1 | Slight |
| Thu 19 Mar 1998 | Barnet | 1 | 1 | Slight |
| Thu 19 Mar 1998 | Barnet | 1 | 1 | Slight |
| Sat 21 Mar 1998 | Barnet | 1 | 1 | Slight |
| Sat 21 Mar 1998 | Hertsmere | 2 | 1 | Serious |
| Sat 21 Mar 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Sun 22 Mar 1998 | Barnet | 2 | 1 | Slight |
| Thu 26 Mar 1998 | Barnet | 2 | 1 | Slight |
| Fri 3 Apr 1998 | Barnet | 2 | 1 | Slight |
| Fri 3 Apr 1998 | Barnet | 2 | 1 | Slight |
| Fri 3 Apr 1998 | Barnet | 2 | 1 | Slight |
| Sun 12 Apr 1998 | Hertsmere | 1 | 1 | Slight |
| Thu 16 Apr 1998 | Middlesbrough | 2 | 1 | Slight |
| Thu 16 Apr 1998 | Barnet | 2 | 1 | Slight |
| Sat 18 Apr 1998 | Barnet | 4 | 2 | Slight |
| Sat 18 Apr 1998 | Barnet | 4 | 2 | Slight |
| Sat 18 Apr 1998 | Barnet | 2 | 1 | Slight |
| Sat 18 Apr 1998 | Barnet | 2 | 1 | Slight |
| Mon 20 Apr 1998 | Barnet | 1 | 2 | Slight |
| Tue 21 Apr 1998 | Hertsmere | 2 | 1 | Slight |
| Fri 24 Apr 1998 | Barnet | 2 | 1 | Slight |
| Sat 25 Apr 1998 | Barnet | 1 | 1 | Serious |
| Sat 25 Apr 1998 | Barnet | 1 | 1 | Slight |
| Wed 29 Apr 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Sat 2 May 1998 | Hertsmere | 2 | 1 | Slight |
| Sat 2 May 1998 | Welwyn Hatfield | 2 | 3 | Slight |
| Thu 7 May 1998 | Welwyn Hatfield | 2 | 3 | Serious |
| Sat 9 May 1998 | Barnet | 2 | 1 | Slight |
| Sat 9 May 1998 | Barnet | 2 | 1 | Serious |
| Sun 10 May 1998 | Barnet | 2 | 1 | Slight |
| Wed 13 May 1998 | Barnet | 2 | 1 | Slight |
| Sat 16 May 1998 | Barnet | 2 | 1 | Serious |
| Sat 16 May 1998 | Barnet | 1 | 1 | Serious |
| Mon 18 May 1998 | Welwyn Hatfield | 4 | 2 | Slight |
| Mon 18 May 1998 | Hertsmere | 1 | 1 | Slight |
| Tue 19 May 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Tue 19 May 1998 | Barnet | 2 | 1 | Slight |
| Wed 20 May 1998 | Barnet | 2 | 1 | Slight |
| Wed 20 May 1998 | Barnet | 2 | 2 | Slight |
| Fri 22 May 1998 | Barnet | 2 | 1 | Slight |
| Sat 23 May 1998 | Barnet | 2 | 1 | Slight |
| Sat 23 May 1998 | Welwyn Hatfield | 3 | 3 | Serious |
| Sun 24 May 1998 | Welwyn Hatfield | 1 | 1 | Slight |
| Mon 25 May 1998 | Barnet | 2 | 1 | Slight |
| Thu 28 May 1998 | Barnet | 2 | 3 | Slight |
| Sat 30 May 1998 | Barnet | 1 | 1 | Slight |
| Mon 1 Jun 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Thu 4 Jun 1998 | Barnet | 2 | 1 | Slight |
| Thu 4 Jun 1998 | Barnet | 1 | 1 | Slight |
| Thu 4 Jun 1998 | Haringey | 1 | 1 | Slight |
| Fri 5 Jun 1998 | Barnet | 1 | 1 | Serious |
| Fri 5 Jun 1998 | Welwyn Hatfield | 2 | 4 | Slight |
| Sun 7 Jun 1998 | Barnet | 1 | 1 | Serious |
| Sun 7 Jun 1998 | Welwyn Hatfield | 2 | 4 | Serious |
| Wed 10 Jun 1998 | Barnet | 2 | 1 | Slight |
| Wed 10 Jun 1998 | Barnet | 2 | 1 | Slight |
| Thu 11 Jun 1998 | Welwyn Hatfield | 2 | 2 | Slight |
| Thu 11 Jun 1998 | Welwyn Hatfield | 3 | 1 | Slight |
| Sat 13 Jun 1998 | Barnet | 2 | 1 | Slight |
| Mon 15 Jun 1998 | Barnet | 2 | 2 | Slight |
| Wed 17 Jun 1998 | Haringey | 2 | 1 | Slight |
| Thu 18 Jun 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Thu 18 Jun 1998 | Barnet | 2 | 1 | Slight |
| Sat 20 Jun 1998 | Barnet | 1 | 1 | Slight |
| Sat 20 Jun 1998 | Barnet | 2 | 1 | Slight |
| Sun 21 Jun 1998 | Hertsmere | 1 | 1 | Slight |
| Mon 22 Jun 1998 | Barnet | 1 | 1 | Slight |
| Tue 23 Jun 1998 | Welwyn Hatfield | 3 | 1 | Slight |
| Tue 23 Jun 1998 | Welwyn Hatfield | 1 | 1 | Slight |
| Wed 24 Jun 1998 | Barnet | 2 | 2 | Slight |
| Thu 25 Jun 1998 | Hertsmere | 4 | 4 | Serious |
| Thu 25 Jun 1998 | Hertsmere | 4 | 4 | Serious |
| Fri 26 Jun 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Sat 27 Jun 1998 | Barnet | 2 | 1 | Slight |
| Sat 27 Jun 1998 | Welwyn Hatfield | 2 | 2 | Slight |
| Mon 29 Jun 1998 | Welwyn Hatfield | 2 | 2 | Slight |
| Tue 30 Jun 1998 | Hertsmere | 1 | 2 | Slight |
| Tue 30 Jun 1998 | Barnet | 1 | 2 | Slight |
| Wed 1 Jul 1998 | Barnet | 2 | 1 | Slight |
| Thu 2 Jul 1998 | Barnet | 1 | 1 | Slight |
| Sun 5 Jul 1998 | Barnet | 2 | 1 | Slight |
| Sun 5 Jul 1998 | Barnet | 2 | 1 | Slight |
| Tue 7 Jul 1998 | Barnet | 1 | 1 | Slight |
| Wed 8 Jul 1998 | Barnet | 2 | 1 | Slight |
| Thu 9 Jul 1998 | Barnet | 2 | 1 | Slight |
| Fri 10 Jul 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Fri 10 Jul 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Sat 11 Jul 1998 | Welwyn Hatfield | 2 | 3 | Serious |
| Sat 11 Jul 1998 | Welwyn Hatfield | 2 | 2 | Slight |
| Mon 13 Jul 1998 | Welwyn Hatfield | 2 | 1 | Serious |
| Wed 15 Jul 1998 | Welwyn Hatfield | 5 | 1 | Serious |
| Thu 16 Jul 1998 | Barnet | 2 | 1 | Serious |
| Thu 16 Jul 1998 | Barnet | 2 | 1 | Serious |
| Sat 18 Jul 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Mon 20 Jul 1998 | Hertsmere | 2 | 1 | Slight |
| Mon 20 Jul 1998 | Barnet | 1 | 1 | Slight |
| Tue 21 Jul 1998 | Welwyn Hatfield | 2 | 2 | Slight |
| Wed 22 Jul 1998 | Welwyn Hatfield | 1 | 1 | Slight |
| Wed 22 Jul 1998 | Barnet | 2 | 1 | Slight |
| Fri 24 Jul 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Sun 26 Jul 1998 | Barnet | 2 | 1 | Slight |
| Mon 27 Jul 1998 | Welwyn Hatfield | 3 | 1 | Slight |
| Tue 28 Jul 1998 | Welwyn Hatfield | 2 | 2 | Slight |
| Wed 29 Jul 1998 | Barnet | 1 | 1 | Slight |
| Wed 29 Jul 1998 | Barnet | 2 | 1 | Slight |
| Fri 31 Jul 1998 | Barnet | 2 | 1 | Slight |
| Fri 31 Jul 1998 | Barnet | 2 | 2 | Slight |
| Fri 31 Jul 1998 | Welwyn Hatfield | 1 | 2 | Serious |
| Sat 1 Aug 1998 | Barnet | 1 | 1 | Serious |
| Sat 1 Aug 1998 | Barnet | 3 | 3 | Serious |
| Wed 5 Aug 1998 | Barnet | 2 | 1 | Serious |
| Thu 6 Aug 1998 | Welwyn Hatfield | 2 | 2 | Slight |
| Fri 7 Aug 1998 | Barnet | 1 | 2 | Slight |
| Sun 9 Aug 1998 | Welwyn Hatfield | 2 | 8 | Serious |
| Mon 10 Aug 1998 | Barnet | 2 | 1 | Serious |
| Tue 11 Aug 1998 | Welwyn Hatfield | 2 | 2 | Slight |
| Tue 11 Aug 1998 | Welwyn Hatfield | 2 | 1 | Serious |
| Wed 12 Aug 1998 | Barnet | 3 | 1 | Slight |
| Sat 15 Aug 1998 | Barnet | 2 | 1 | Slight |
| Fri 21 Aug 1998 | Welwyn Hatfield | 3 | 4 | Serious |
| Mon 24 Aug 1998 | Hertsmere | 1 | 1 | Slight |
| Wed 2 Sep 1998 | Barnet | 2 | 1 | Slight |
| Wed 2 Sep 1998 | Welwyn Hatfield | 2 | 3 | Slight |
| Fri 4 Sep 1998 | Barnet | 3 | 1 | Slight |
| Mon 7 Sep 1998 | Barnet | 1 | 1 | Slight |
| Mon 7 Sep 1998 | Welwyn Hatfield | 3 | 4 | Slight |
| Tue 8 Sep 1998 | Barnet | 2 | 1 | Slight |
| Tue 8 Sep 1998 | Hertsmere | 2 | 1 | Slight |
| Tue 8 Sep 1998 | Hertsmere | 2 | 1 | Slight |
| Wed 9 Sep 1998 | Barnet | 1 | 1 | Slight |
| Sun 13 Sep 1998 | Barnet | 1 | 1 | Slight |
| Sun 13 Sep 1998 | Barnet | 3 | 1 | Serious |
| Mon 14 Sep 1998 | Hertsmere | 2 | 1 | Slight |
| Tue 15 Sep 1998 | Barnet | 2 | 2 | Slight |
| Wed 16 Sep 1998 | Barnet | 2 | 1 | Serious |
| Fri 18 Sep 1998 | Barnet | 1 | 1 | Slight |
| Mon 21 Sep 1998 | Barnet | 1 | 1 | Slight |
| Mon 21 Sep 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Wed 23 Sep 1998 | Welwyn Hatfield | 2 | 1 | Serious |
| Sat 3 Oct 1998 | Barnet | 3 | 4 | Serious |
| Sat 3 Oct 1998 | Barnet | 1 | 1 | Serious |
| Mon 5 Oct 1998 | Barnet | 2 | 1 | Slight |
| Mon 5 Oct 1998 | Barnet | 2 | 1 | Slight |
| Tue 6 Oct 1998 | Barnet | 2 | 1 | Slight |
| Tue 6 Oct 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Wed 7 Oct 1998 | Barnet | 1 | 1 | Serious |
| Fri 9 Oct 1998 | Hertsmere | 2 | 1 | Slight |
| Fri 9 Oct 1998 | Barnet | 2 | 1 | Serious |
| Sat 10 Oct 1998 | Barnet | 2 | 4 | Slight |
| Sat 10 Oct 1998 | Haringey | 2 | 3 | Serious |
| Mon 12 Oct 1998 | Barnet | 3 | 1 | Slight |
| Wed 14 Oct 1998 | Hertsmere | 2 | 2 | Slight |
| Wed 14 Oct 1998 | Barnet | 2 | 1 | Slight |
| Sat 17 Oct 1998 | Hertsmere | 1 | 1 | Slight |
| Mon 19 Oct 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Mon 19 Oct 1998 | Barnet | 1 | 1 | Serious |
| Mon 19 Oct 1998 | Barnet | 1 | 1 | Slight |
| Mon 19 Oct 1998 | Hertsmere | 1 | 1 | Slight |
| Mon 19 Oct 1998 | Barnet | 1 | 1 | Serious |
| Fri 23 Oct 1998 | Welwyn Hatfield | 2 | 5 | Serious |
| Mon 26 Oct 1998 | Barnet | 2 | 1 | Serious |
| Tue 27 Oct 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Wed 28 Oct 1998 | Barnet | 2 | 1 | Slight |
| Wed 28 Oct 1998 | Barnet | 2 | 3 | Slight |
| Thu 29 Oct 1998 | Barnet | 2 | 1 | Slight |
| Fri 30 Oct 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Fri 30 Oct 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Fri 30 Oct 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Fri 30 Oct 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Fri 30 Oct 1998 | Welwyn Hatfield | 2 | 2 | Slight |
| Fri 30 Oct 1998 | Barnet | 2 | 4 | Fatal |
| Sat 31 Oct 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Mon 2 Nov 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Wed 4 Nov 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Thu 5 Nov 1998 | Barnet | 1 | 1 | Serious |
| Fri 6 Nov 1998 | Welwyn Hatfield | 3 | 1 | Slight |
| Fri 6 Nov 1998 | Barnet | 2 | 1 | Slight |
| Sat 7 Nov 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Wed 11 Nov 1998 | Welwyn Hatfield | 2 | 2 | Slight |
| Fri 13 Nov 1998 | Barnet | 1 | 1 | Slight |
| Fri 13 Nov 1998 | Barnet | 1 | 1 | Slight |
| Tue 17 Nov 1998 | Barnet | 1 | 1 | Slight |
| Tue 17 Nov 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Thu 19 Nov 1998 | Barnet | 2 | 1 | Serious |
| Mon 23 Nov 1998 | Barnet | 1 | 1 | Slight |
| Tue 24 Nov 1998 | Barnet | 2 | 1 | Slight |
| Thu 26 Nov 1998 | Welwyn Hatfield | 2 | 1 | Serious |
| Fri 27 Nov 1998 | Barnet | 3 | 1 | Slight |
| Fri 27 Nov 1998 | Barnet | 1 | 1 | Slight |
| Sat 28 Nov 1998 | Hertsmere | 2 | 1 | Slight |
| Sat 28 Nov 1998 | Hertsmere | 1 | 1 | Slight |
| Sun 29 Nov 1998 | Hertsmere | 2 | 2 | Fatal |
| Mon 30 Nov 1998 | Hertsmere | 4 | 5 | Slight |
| Tue 1 Dec 1998 | Barnet | 2 | 1 | Slight |
| Wed 2 Dec 1998 | Barnet | 2 | 1 | Slight |
| Sat 5 Dec 1998 | Welwyn Hatfield | 2 | 3 | Slight |
| Mon 7 Dec 1998 | Barnet | 1 | 1 | Serious |
| Tue 8 Dec 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Thu 10 Dec 1998 | Hertsmere | 1 | 1 | Slight |
| Thu 10 Dec 1998 | Barnet | 2 | 1 | Slight |
| Sat 12 Dec 1998 | Barnet | 2 | 1 | Slight |
| Sun 13 Dec 1998 | Barnet | 1 | 1 | Slight |
| Wed 16 Dec 1998 | Welwyn Hatfield | 3 | 1 | Slight |
| Wed 16 Dec 1998 | Barnet | 1 | 2 | Slight |
| Thu 17 Dec 1998 | Barnet | 1 | 1 | Slight |
| Fri 18 Dec 1998 | Hertsmere | 2 | 3 | Serious |
| Fri 18 Dec 1998 | Welwyn Hatfield | 1 | 2 | Slight |
| Sat 19 Dec 1998 | Barnet | 2 | 1 | Slight |
| Mon 21 Dec 1998 | Hertsmere | 1 | 1 | Slight |
| Tue 22 Dec 1998 | Barnet | 3 | 2 | Slight |
| Thu 24 Dec 1998 | Welwyn Hatfield | 2 | 1 | Slight |
| Thu 24 Dec 1998 | Barnet | 1 | 1 | Slight |
| Tue 29 Dec 1998 | Barnet | 1 | 1 | Slight |