Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Mon 9 Jan 1984 | Three Rivers | 2 | 2 | Serious |
| Sat 21 Jan 1984 | Three Rivers | 2 | 1 | Slight |
| Wed 25 Jan 1984 | Watford | 1 | 1 | Serious |
| Fri 3 Feb 1984 | Three Rivers | 1 | 2 | Slight |
| Sat 4 Feb 1984 | Watford | 2 | 1 | Slight |
| Sat 4 Feb 1984 | Watford | 2 | 2 | Slight |
| Fri 10 Feb 1984 | Three Rivers | 3 | 2 | Slight |
| Mon 13 Feb 1984 | Three Rivers | 2 | 2 | Slight |
| Fri 24 Feb 1984 | Watford | 2 | 2 | Serious |
| Fri 2 Mar 1984 | Watford | 2 | 1 | Slight |
| Sat 24 Mar 1984 | Watford | 3 | 1 | Slight |
| Wed 18 Apr 1984 | Three Rivers | 2 | 4 | Serious |
| Fri 20 Apr 1984 | Watford | 2 | 1 | Slight |
| Thu 26 Apr 1984 | Three Rivers | 1 | 1 | Serious |
| Wed 2 May 1984 | Three Rivers | 2 | 2 | Slight |
| Fri 11 May 1984 | Three Rivers | 1 | 1 | Slight |
| Mon 14 May 1984 | Watford | 2 | 1 | Slight |
| Fri 8 Jun 1984 | Watford | 2 | 2 | Slight |
| Tue 19 Jun 1984 | Three Rivers | 2 | 2 | Slight |
| Tue 26 Jun 1984 | Watford | 2 | 1 | Slight |
| Sun 15 Jul 1984 | Three Rivers | 1 | 1 | Slight |
| Mon 6 Aug 1984 | Watford | 3 | 1 | Slight |
| Sat 11 Aug 1984 | Watford | 2 | 3 | Serious |
| Mon 3 Sep 1984 | Three Rivers | 1 | 1 | Slight |
| Tue 4 Sep 1984 | Three Rivers | 1 | 1 | Serious |
| Sat 8 Sep 1984 | Watford | 2 | 1 | Slight |
| Fri 5 Oct 1984 | Three Rivers | 3 | 4 | Serious |
| Thu 18 Oct 1984 | Three Rivers | 2 | 2 | Slight |
| Fri 2 Nov 1984 | Three Rivers | 2 | 1 | Slight |
| Tue 6 Nov 1984 | Three Rivers | 3 | 1 | Slight |
| Fri 16 Nov 1984 | Three Rivers | 2 | 1 | Slight |
| Tue 20 Nov 1984 | Three Rivers | 3 | 1 | Slight |
| Fri 7 Dec 1984 | Watford | 2 | 1 | Slight |
| Fri 7 Dec 1984 | Three Rivers | 3 | 1 | Slight |
| Mon 10 Dec 1984 | Three Rivers | 2 | 1 | Slight |
| Thu 13 Dec 1984 | Three Rivers | 2 | 1 | Slight |
| Thu 20 Dec 1984 | Three Rivers | 2 | 1 | Slight |
| Sat 29 Dec 1984 | Watford | 1 | 1 | Slight |
| Sun 30 Dec 1984 | Three Rivers | 1 | 1 | Serious |