Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Fri 4 Jan 1980 | Watford | 1 | 1 | Slight |
| Fri 4 Jan 1980 | Watford | 1 | 1 | Slight |
| Sat 5 Jan 1980 | Barnet | 2 | 1 | Slight |
| Tue 8 Jan 1980 | Hertsmere | 1 | 1 | Slight |
| Thu 10 Jan 1980 | Watford | 1 | 1 | Serious |
| Thu 10 Jan 1980 | Watford | 1 | 1 | Serious |
| Tue 15 Jan 1980 | Hertsmere | 1 | 2 | Serious |
| Wed 16 Jan 1980 | Hertsmere | 2 | 2 | Slight |
| Wed 16 Jan 1980 | Hertsmere | 3 | 3 | Fatal |
| Fri 18 Jan 1980 | Barnet | 2 | 1 | Slight |
| Sat 19 Jan 1980 | Hertsmere | 2 | 1 | Slight |
| Wed 23 Jan 1980 | Barnet | 2 | 2 | Slight |
| Thu 24 Jan 1980 | Hertsmere | 2 | 1 | Slight |
| Thu 24 Jan 1980 | Barnet | 3 | 1 | Slight |
| Fri 25 Jan 1980 | Watford | 2 | 1 | Slight |
| Fri 25 Jan 1980 | Hertsmere | 1 | 1 | Slight |
| Sat 26 Jan 1980 | Hertsmere | 1 | 1 | Fatal |
| Sat 26 Jan 1980 | Watford | 4 | 1 | Serious |
| Sat 26 Jan 1980 | Watford | 4 | 1 | Serious |
| Thu 31 Jan 1980 | Hertsmere | 1 | 1 | Slight |
| Mon 4 Feb 1980 | Watford | 2 | 4 | Serious |
| Sat 9 Feb 1980 | Watford | 3 | 1 | Slight |
| Fri 15 Feb 1980 | Watford | 2 | 1 | Slight |
| Fri 15 Feb 1980 | Watford | 2 | 1 | Slight |
| Sat 16 Feb 1980 | Hertsmere | 1 | 1 | Slight |
| Sun 17 Feb 1980 | Cotswold | 2 | 1 | Slight |
| Fri 22 Feb 1980 | Hertsmere | 1 | 1 | Slight |
| Mon 25 Feb 1980 | Hertsmere | 2 | 1 | Slight |
| Thu 28 Feb 1980 | Barnet | 2 | 1 | Slight |
| Fri 29 Feb 1980 | Barnet | 1 | 1 | Slight |
| Fri 29 Feb 1980 | Watford | 1 | 1 | Serious |
| Fri 29 Feb 1980 | Watford | 1 | 1 | Serious |
| Sat 1 Mar 1980 | Hertsmere | 3 | 1 | Slight |
| Sat 1 Mar 1980 | Hertsmere | 2 | 2 | Serious |
| Tue 11 Mar 1980 | Watford | 2 | 1 | Serious |
| Tue 11 Mar 1980 | Watford | 2 | 1 | Serious |
| Sat 15 Mar 1980 | Hertsmere | 1 | 2 | Slight |
| Tue 18 Mar 1980 | Hertsmere | 1 | 1 | Serious |
| Tue 25 Mar 1980 | Hertsmere | 1 | 1 | Slight |
| Wed 26 Mar 1980 | Watford | 2 | 1 | Slight |
| Wed 26 Mar 1980 | Watford | 2 | 1 | Slight |
| Sat 29 Mar 1980 | Hertsmere | 2 | 1 | Slight |
| Sat 29 Mar 1980 | Watford | 2 | 3 | Slight |
| Sat 29 Mar 1980 | Watford | 2 | 3 | Slight |
| Thu 10 Apr 1980 | Barnet | 2 | 1 | Slight |
| Thu 10 Apr 1980 | Hertsmere | 2 | 3 | Serious |
| Fri 11 Apr 1980 | Barnet | 1 | 3 | Slight |
| Sun 13 Apr 1980 | Barnet | 2 | 1 | Slight |
| Mon 14 Apr 1980 | Watford | 1 | 2 | Serious |
| Fri 18 Apr 1980 | Watford | 1 | 1 | Serious |
| Fri 18 Apr 1980 | Watford | 1 | 1 | Serious |
| Mon 21 Apr 1980 | Hertsmere | 2 | 1 | Slight |
| Thu 24 Apr 1980 | Hertsmere | 2 | 1 | Slight |
| Thu 24 Apr 1980 | Barnet | 1 | 1 | Serious |
| Sun 27 Apr 1980 | Barnet | 3 | 1 | Slight |
| Wed 30 Apr 1980 | Watford | 1 | 1 | Slight |
| Fri 9 May 1980 | Watford | 3 | 1 | Slight |
| Tue 20 May 1980 | Barnet | 3 | 1 | Slight |
| Tue 20 May 1980 | Hertsmere | 2 | 1 | Slight |
| Tue 27 May 1980 | Hertsmere | 1 | 2 | Serious |
| Tue 27 May 1980 | Watford | 2 | 1 | Serious |
| Thu 29 May 1980 | Watford | 1 | 2 | Serious |
| Thu 29 May 1980 | Watford | 1 | 2 | Serious |
| Fri 30 May 1980 | Watford | 2 | 1 | Slight |
| Sun 1 Jun 1980 | Watford | 1 | 1 | Slight |
| Mon 2 Jun 1980 | Barnet | 1 | 1 | Slight |
| Fri 6 Jun 1980 | Watford | 3 | 1 | Slight |
| Thu 12 Jun 1980 | Watford | 2 | 1 | Slight |
| Thu 12 Jun 1980 | Watford | 2 | 1 | Slight |
| Wed 18 Jun 1980 | Watford | 2 | 1 | Slight |
| Wed 18 Jun 1980 | Watford | 2 | 1 | Slight |
| Fri 20 Jun 1980 | Hertsmere | 1 | 1 | Slight |
| Sun 22 Jun 1980 | Watford | 2 | 1 | Slight |
| Tue 24 Jun 1980 | Watford | 2 | 1 | Slight |
| Tue 24 Jun 1980 | Watford | 2 | 1 | Slight |
| Wed 25 Jun 1980 | Three Rivers | 2 | 1 | Slight |
| Wed 25 Jun 1980 | Three Rivers | 2 | 1 | Slight |
| Mon 30 Jun 1980 | Hertsmere | 1 | 1 | Slight |
| Wed 2 Jul 1980 | Barnet | 2 | 1 | Slight |
| Sun 6 Jul 1980 | Watford | 2 | 2 | Serious |
| Wed 9 Jul 1980 | Watford | 1 | 1 | Slight |
| Wed 9 Jul 1980 | Watford | 1 | 1 | Slight |
| Fri 18 Jul 1980 | Watford | 1 | 1 | Slight |
| Sat 19 Jul 1980 | Hertsmere | 2 | 1 | Slight |
| Wed 23 Jul 1980 | Barnet | 2 | 1 | Slight |
| Fri 25 Jul 1980 | Harrow | 2 | 1 | Slight |
| Fri 25 Jul 1980 | Watford | 2 | 1 | Slight |
| Mon 28 Jul 1980 | Watford | 1 | 2 | Serious |
| Tue 29 Jul 1980 | Barnet | 3 | 7 | Slight |
| Fri 1 Aug 1980 | Barnet | 2 | 5 | Serious |
| Fri 1 Aug 1980 | Watford | 1 | 1 | Slight |
| Fri 1 Aug 1980 | Watford | 1 | 1 | Slight |
| Thu 7 Aug 1980 | Watford | 1 | 1 | Slight |
| Sat 9 Aug 1980 | Hertsmere | 1 | 2 | Serious |
| Thu 14 Aug 1980 | Hertsmere | 3 | 1 | Serious |
| Thu 21 Aug 1980 | Watford | 2 | 1 | Slight |
| Thu 21 Aug 1980 | Watford | 2 | 1 | Slight |
| Sun 24 Aug 1980 | Hertsmere | 1 | 1 | Slight |
| Mon 25 Aug 1980 | Watford | 1 | 1 | Serious |
| Mon 25 Aug 1980 | Watford | 1 | 1 | Serious |
| Tue 26 Aug 1980 | Watford | 2 | 1 | Slight |
| Sun 31 Aug 1980 | Barnet | 2 | 1 | Slight |
| Thu 4 Sep 1980 | Watford | 1 | 1 | Slight |
| Thu 4 Sep 1980 | Watford | 1 | 1 | Slight |
| Fri 5 Sep 1980 | Hertsmere | 2 | 1 | Slight |
| Sun 7 Sep 1980 | Watford | 1 | 1 | Slight |
| Mon 8 Sep 1980 | Hertsmere | 1 | 1 | Serious |
| Thu 11 Sep 1980 | Hertsmere | 1 | 1 | Slight |
| Fri 12 Sep 1980 | Watford | 1 | 1 | Slight |
| Tue 16 Sep 1980 | Hertsmere | 2 | 1 | Serious |
| Tue 16 Sep 1980 | Hertsmere | 2 | 2 | Slight |
| Thu 18 Sep 1980 | Hertsmere | 1 | 1 | Slight |
| Sun 21 Sep 1980 | Barnet | 1 | 2 | Serious |
| Mon 22 Sep 1980 | Watford | 2 | 1 | Slight |
| Mon 22 Sep 1980 | Watford | 2 | 1 | Slight |
| Mon 29 Sep 1980 | Watford | 2 | 1 | Serious |
| Thu 2 Oct 1980 | Watford | 3 | 2 | Slight |
| Thu 2 Oct 1980 | Watford | 3 | 2 | Slight |
| Thu 2 Oct 1980 | Watford | 2 | 1 | Serious |
| Thu 2 Oct 1980 | Watford | 2 | 1 | Serious |
| Fri 3 Oct 1980 | Watford | 2 | 1 | Slight |
| Sat 4 Oct 1980 | Barnet | 2 | 1 | Slight |
| Sat 4 Oct 1980 | Hertsmere | 3 | 4 | Serious |
| Sat 11 Oct 1980 | Barnet | 1 | 1 | Serious |
| Sat 11 Oct 1980 | Watford | 1 | 1 | Slight |
| Wed 15 Oct 1980 | Hertsmere | 2 | 3 | Serious |
| Wed 15 Oct 1980 | Barnet | 2 | 1 | Slight |
| Thu 16 Oct 1980 | Barnet | 2 | 1 | Slight |
| Wed 22 Oct 1980 | Hertsmere | 1 | 1 | Slight |
| Mon 27 Oct 1980 | Barnet | 1 | 1 | Slight |
| Wed 29 Oct 1980 | Watford | 2 | 1 | Slight |
| Sat 1 Nov 1980 | Hertsmere | 1 | 1 | Slight |
| Thu 6 Nov 1980 | Barnet | 2 | 1 | Serious |
| Mon 17 Nov 1980 | Barnet | 4 | 1 | Slight |
| Mon 17 Nov 1980 | Barnet | 2 | 1 | Slight |
| Mon 17 Nov 1980 | Hertsmere | 3 | 3 | Slight |
| Tue 18 Nov 1980 | Watford | 2 | 1 | Slight |
| Fri 21 Nov 1980 | Hertsmere | 2 | 1 | Slight |
| Sat 22 Nov 1980 | Watford | 4 | 1 | Slight |
| Wed 26 Nov 1980 | Hertsmere | 1 | 1 | Slight |
| Thu 27 Nov 1980 | Watford | 2 | 1 | Slight |
| Thu 27 Nov 1980 | Watford | 2 | 1 | Slight |
| Thu 4 Dec 1980 | Watford | 2 | 1 | Slight |
| Thu 4 Dec 1980 | Hertsmere | 2 | 1 | Slight |
| Fri 5 Dec 1980 | Watford | 1 | 1 | Slight |
| Wed 10 Dec 1980 | Hertsmere | 1 | 1 | Slight |
| Thu 18 Dec 1980 | Hertsmere | 3 | 2 | Serious |
| Mon 22 Dec 1980 | Hertsmere | 2 | 1 | Slight |
| Wed 24 Dec 1980 | Hertsmere | 2 | 1 | Slight |
| Sat 27 Dec 1980 | Watford | 1 | 1 | Slight |
| Mon 29 Dec 1980 | Hertsmere | 1 | 1 | Slight |