Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Fri 23 Jan 1998 | Three Rivers | 2 | 1 | Serious |
| Sat 31 Jan 1998 | Watford | 2 | 1 | Slight |
| Tue 17 Feb 1998 | Watford | 2 | 1 | Slight |
| Sat 28 Feb 1998 | Three Rivers | 2 | 1 | Serious |
| Fri 6 Mar 1998 | Watford | 2 | 2 | Slight |
| Wed 8 Apr 1998 | Watford | 2 | 2 | Slight |
| Sat 18 Apr 1998 | Watford | 2 | 3 | Serious |
| Tue 5 May 1998 | Watford | 2 | 1 | Slight |
| Sat 9 May 1998 | Watford | 2 | 1 | Slight |
| Mon 25 May 1998 | Three Rivers | 2 | 3 | Serious |
| Wed 3 Jun 1998 | Three Rivers | 2 | 1 | Slight |
| Sun 7 Jun 1998 | Three Rivers | 1 | 1 | Serious |
| Tue 7 Jul 1998 | Watford | 2 | 2 | Slight |
| Tue 4 Aug 1998 | Watford | 2 | 1 | Serious |
| Tue 4 Aug 1998 | Watford | 2 | 1 | Serious |
| Fri 7 Aug 1998 | Three Rivers | 1 | 2 | Serious |
| Wed 12 Aug 1998 | Three Rivers | 2 | 2 | Serious |
| Fri 14 Aug 1998 | Three Rivers | 1 | 1 | Serious |
| Sun 4 Oct 1998 | Three Rivers | 1 | 1 | Serious |
| Thu 8 Oct 1998 | Three Rivers | 1 | 1 | Slight |
| Sun 8 Nov 1998 | Three Rivers | 2 | 1 | Slight |
| Fri 20 Nov 1998 | Watford | 2 | 2 | Serious |
| Sat 28 Nov 1998 | Watford | 1 | 1 | Slight |
| Tue 15 Dec 1998 | Three Rivers | 2 | 1 | Slight |
| Sun 20 Dec 1998 | Three Rivers | 3 | 1 | Slight |