Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Sun 20 Jan 1980 | Hertsmere | 2 | 1 | Slight |
| Sun 27 Jan 1980 | Harrow | 2 | 1 | Slight |
| Tue 29 Jan 1980 | Hertsmere | 2 | 1 | Slight |
| Wed 30 Jan 1980 | Hertsmere | 2 | 1 | Slight |
| Mon 4 Feb 1980 | Hertsmere | 2 | 2 | Slight |
| Thu 7 Feb 1980 | Hertsmere | 2 | 1 | Slight |
| Mon 11 Feb 1980 | Three Rivers | 2 | 1 | Slight |
| Mon 11 Feb 1980 | Three Rivers | 2 | 1 | Slight |
| Sat 16 Feb 1980 | Watford | 1 | 1 | Slight |
| Fri 22 Feb 1980 | Hertsmere | 2 | 1 | Slight |
| Thu 28 Feb 1980 | Hertsmere | 1 | 1 | Slight |
| Sun 9 Mar 1980 | Watford | 1 | 1 | Slight |
| Sun 9 Mar 1980 | Watford | 1 | 1 | Slight |
| Sun 9 Mar 1980 | Hertsmere | 3 | 2 | Serious |
| Mon 10 Mar 1980 | Hertsmere | 2 | 2 | Slight |
| Wed 12 Mar 1980 | Hertsmere | 2 | 2 | Slight |
| Wed 12 Mar 1980 | Hertsmere | 2 | 1 | Slight |
| Fri 14 Mar 1980 | Watford | 1 | 1 | Serious |
| Fri 4 Apr 1980 | Watford | 1 | 1 | Slight |
| Fri 4 Apr 1980 | Watford | 1 | 1 | Slight |
| Tue 8 Apr 1980 | Hertsmere | 2 | 1 | Slight |
| Thu 10 Apr 1980 | Three Rivers | 2 | 1 | Slight |
| Thu 17 Apr 1980 | Harrow | 3 | 1 | Slight |
| Sun 20 Apr 1980 | Hertsmere | 2 | 1 | Slight |
| Sun 20 Apr 1980 | Watford | 1 | 1 | Slight |
| Sun 20 Apr 1980 | Watford | 1 | 1 | Slight |
| Wed 23 Apr 1980 | Hertsmere | 1 | 1 | Slight |
| Fri 25 Apr 1980 | Three Rivers | 1 | 1 | Slight |
| Sat 3 May 1980 | Watford | 3 | 1 | Slight |
| Sat 3 May 1980 | Watford | 3 | 1 | Slight |
| Sat 10 May 1980 | Brent | 2 | 1 | Serious |
| Thu 15 May 1980 | Hertsmere | 2 | 1 | Slight |
| Sat 24 May 1980 | Brent | 2 | 1 | Slight |
| Sun 29 Jun 1980 | Hertsmere | 3 | 3 | Slight |
| Sun 29 Jun 1980 | Harrow | 2 | 2 | Serious |
| Thu 3 Jul 1980 | Watford | 2 | 4 | Fatal |
| Mon 14 Jul 1980 | Brent | 2 | 1 | Slight |
| Tue 29 Jul 1980 | Hertsmere | 3 | 2 | Slight |
| Mon 11 Aug 1980 | Three Rivers | 1 | 1 | Slight |
| Wed 13 Aug 1980 | Hertsmere | 2 | 1 | Slight |
| Fri 22 Aug 1980 | Hertsmere | 3 | 3 | Slight |
| Wed 27 Aug 1980 | Harrow | 2 | 1 | Slight |
| Wed 3 Sep 1980 | Harrow | 1 | 1 | Slight |
| Sun 7 Sep 1980 | Hertsmere | 2 | 1 | Slight |
| Mon 8 Sep 1980 | Watford | 2 | 1 | Slight |
| Mon 8 Sep 1980 | Watford | 2 | 1 | Slight |
| Wed 10 Sep 1980 | Hertsmere | 3 | 2 | Serious |
| Sat 20 Sep 1980 | Harrow | 2 | 2 | Slight |
| Tue 30 Sep 1980 | Hertsmere | 4 | 1 | Serious |
| Thu 2 Oct 1980 | Watford | 2 | 1 | Slight |
| Thu 2 Oct 1980 | Watford | 2 | 1 | Slight |
| Fri 3 Oct 1980 | Hertsmere | 2 | 1 | Slight |
| Sun 19 Oct 1980 | Watford | 2 | 1 | Slight |
| Sun 19 Oct 1980 | Watford | 2 | 1 | Slight |
| Wed 22 Oct 1980 | Hertsmere | 2 | 1 | Slight |
| Thu 23 Oct 1980 | Hertsmere | 2 | 1 | Slight |
| Fri 31 Oct 1980 | Hertsmere | 1 | 1 | Slight |
| Fri 5 Dec 1980 | Hertsmere | 2 | 1 | Slight |
| Sun 7 Dec 1980 | Hertsmere | 3 | 2 | Slight |
| Tue 16 Dec 1980 | Watford | 2 | 1 | Slight |
| Wed 17 Dec 1980 | Hertsmere | 2 | 1 | Slight |
| Thu 18 Dec 1980 | Harrow | 2 | 1 | Fatal |
| Sat 20 Dec 1980 | Watford | 2 | 3 | Slight |
| Sat 20 Dec 1980 | Watford | 2 | 3 | Slight |
| Mon 22 Dec 1980 | Hertsmere | 2 | 1 | Slight |