Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Tue 17 Jan 1989 | St. Albans | 2 | 1 | Slight |
| Fri 3 Feb 1989 | Watford | 3 | 1 | Slight |
| Tue 7 Feb 1989 | St. Albans | 2 | 1 | Slight |
| Thu 16 Feb 1989 | St. Albans | 2 | 1 | Slight |
| Fri 10 Mar 1989 | St. Albans | 2 | 1 | Serious |
| Fri 17 Mar 1989 | St. Albans | 1 | 2 | Slight |
| Sat 18 Mar 1989 | Watford | 2 | 2 | Slight |
| Sun 2 Apr 1989 | Three Rivers | 1 | 3 | Slight |
| Mon 3 Apr 1989 | Three Rivers | 1 | 1 | Fatal |
| Mon 3 Apr 1989 | St. Albans | 2 | 2 | Slight |
| Wed 5 Apr 1989 | Watford | 3 | 1 | Slight |
| Thu 13 Apr 1989 | St. Albans | 1 | 1 | Slight |
| Sun 16 Apr 1989 | Watford | 2 | 2 | Slight |
| Tue 25 Apr 1989 | Three Rivers | 2 | 1 | Slight |
| Tue 2 May 1989 | St. Albans | 1 | 1 | Slight |
| Tue 2 May 1989 | Watford | 2 | 2 | Slight |
| Thu 11 May 1989 | St. Albans | 2 | 2 | Slight |
| Fri 12 May 1989 | Three Rivers | 2 | 1 | Serious |
| Wed 31 May 1989 | St. Albans | 7 | 3 | Fatal |
| Fri 2 Jun 1989 | Watford | 1 | 1 | Slight |
| Tue 6 Jun 1989 | Three Rivers | 1 | 1 | Serious |
| Sat 17 Jun 1989 | Three Rivers | 2 | 1 | Serious |
| Tue 20 Jun 1989 | Watford | 2 | 1 | Serious |
| Wed 5 Jul 1989 | St. Albans | 2 | 2 | Slight |
| Wed 19 Jul 1989 | Watford | 1 | 1 | Serious |
| Mon 7 Aug 1989 | Three Rivers | 1 | 1 | Serious |
| Fri 11 Aug 1989 | St. Albans | 2 | 1 | Slight |
| Tue 19 Sep 1989 | Three Rivers | 2 | 1 | Slight |
| Fri 29 Sep 1989 | St. Albans | 2 | 1 | Slight |
| Fri 29 Sep 1989 | Watford | 3 | 1 | Slight |
| Mon 9 Oct 1989 | Three Rivers | 1 | 1 | Slight |
| Tue 10 Oct 1989 | Watford | 2 | 1 | Serious |
| Sun 22 Oct 1989 | St. Albans | 6 | 3 | Slight |
| Sun 29 Oct 1989 | St. Albans | 2 | 3 | Serious |
| Fri 3 Nov 1989 | Watford | 1 | 1 | Serious |
| Mon 6 Nov 1989 | Watford | 1 | 2 | Serious |
| Tue 7 Nov 1989 | Watford | 3 | 3 | Slight |
| Tue 14 Nov 1989 | Three Rivers | 2 | 1 | Slight |
| Fri 24 Nov 1989 | Watford | 2 | 1 | Slight |
| Fri 24 Nov 1989 | St. Albans | 2 | 2 | Serious |
| Sat 25 Nov 1989 | Three Rivers | 1 | 1 | Slight |
| Tue 5 Dec 1989 | Watford | 2 | 1 | Slight |
| Wed 6 Dec 1989 | St. Albans | 4 | 2 | Slight |
| Sun 17 Dec 1989 | Three Rivers | 2 | 1 | Slight |