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