Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Sun 6 Jan 1980 | East Hertfordshire | 1 | 1 | Slight |
| Wed 9 Jan 1980 | North Hertfordshire | 1 | 1 | Serious |
| Sun 13 Jan 1980 | North Hertfordshire | 2 | 2 | Serious |
| Sun 13 Jan 1980 | North Hertfordshire | 2 | 2 | Serious |
| Sat 19 Jan 1980 | East Hertfordshire | 2 | 1 | Slight |
| Wed 23 Jan 1980 | Stevenage | 2 | 1 | Slight |
| Wed 23 Jan 1980 | Stevenage | 2 | 1 | Slight |
| Fri 25 Jan 1980 | North Hertfordshire | 2 | 2 | Slight |
| Fri 25 Jan 1980 | North Hertfordshire | 2 | 2 | Slight |
| Fri 15 Feb 1980 | North Hertfordshire | 2 | 1 | Slight |
| Thu 21 Feb 1980 | Stevenage | 2 | 1 | Slight |
| Thu 21 Feb 1980 | Stevenage | 2 | 1 | Slight |
| Thu 28 Feb 1980 | Stevenage | 2 | 1 | Slight |
| Thu 28 Feb 1980 | Stevenage | 2 | 1 | Slight |
| Mon 10 Mar 1980 | Stevenage | 1 | 1 | Serious |
| Mon 10 Mar 1980 | Stevenage | 1 | 1 | Serious |
| Thu 20 Mar 1980 | East Hertfordshire | 2 | 2 | Slight |
| Thu 20 Mar 1980 | East Hertfordshire | 2 | 2 | Slight |
| Thu 20 Mar 1980 | Stevenage | 2 | 1 | Slight |
| Sat 22 Mar 1980 | Stevenage | 2 | 1 | Serious |
| Sat 29 Mar 1980 | Stevenage | 1 | 1 | Slight |
| Sat 29 Mar 1980 | Stevenage | 1 | 1 | Slight |
| Tue 1 Apr 1980 | Stevenage | 2 | 1 | Slight |
| Tue 1 Apr 1980 | Stevenage | 2 | 1 | Slight |
| Mon 7 Apr 1980 | East Hertfordshire | 1 | 2 | Slight |
| Mon 7 Apr 1980 | East Hertfordshire | 1 | 2 | Slight |
| Wed 16 Apr 1980 | East Hertfordshire | 1 | 1 | Slight |
| Sun 20 Apr 1980 | Stevenage | 1 | 1 | Slight |
| Sun 20 Apr 1980 | Stevenage | 1 | 1 | Slight |
| Fri 25 Apr 1980 | East Hertfordshire | 1 | 1 | Slight |
| Mon 28 Apr 1980 | Stevenage | 1 | 1 | Slight |
| Mon 28 Apr 1980 | Stevenage | 1 | 1 | Slight |
| Thu 1 May 1980 | Stevenage | 2 | 2 | Serious |
| Thu 8 May 1980 | Stevenage | 1 | 1 | Slight |
| Tue 13 May 1980 | Stevenage | 2 | 3 | Slight |
| Tue 13 May 1980 | Stevenage | 2 | 3 | Slight |
| Wed 14 May 1980 | East Hertfordshire | 2 | 2 | Serious |
| Wed 14 May 1980 | East Hertfordshire | 2 | 2 | Serious |
| Sun 18 May 1980 | East Hertfordshire | 2 | 1 | Slight |
| Sun 18 May 1980 | East Hertfordshire | 2 | 1 | Slight |
| Thu 12 Jun 1980 | Stevenage | 1 | 1 | Slight |
| Thu 12 Jun 1980 | Stevenage | 1 | 1 | Slight |
| Thu 12 Jun 1980 | Stevenage | 1 | 1 | Serious |
| Thu 12 Jun 1980 | Stevenage | 1 | 1 | Serious |
| Sat 21 Jun 1980 | North Hertfordshire | 2 | 3 | Serious |
| Sat 21 Jun 1980 | North Hertfordshire | 2 | 3 | Serious |
| Sat 21 Jun 1980 | East Hertfordshire | 7 | 2 | Fatal |
| Tue 1 Jul 1980 | North Hertfordshire | 2 | 1 | Slight |
| Tue 1 Jul 1980 | North Hertfordshire | 2 | 1 | Slight |
| Wed 2 Jul 1980 | Stevenage | 2 | 1 | Serious |
| Wed 2 Jul 1980 | Stevenage | 2 | 1 | Serious |
| Fri 11 Jul 1980 | Stevenage | 2 | 2 | Slight |
| Fri 11 Jul 1980 | Stevenage | 2 | 2 | Slight |
| Sat 19 Jul 1980 | East Hertfordshire | 1 | 2 | Slight |
| Sat 19 Jul 1980 | East Hertfordshire | 1 | 2 | Slight |
| Mon 28 Jul 1980 | East Hertfordshire | 2 | 1 | Slight |
| Sat 16 Aug 1980 | Stevenage | 1 | 1 | Serious |
| Tue 19 Aug 1980 | Stevenage | 1 | 1 | Fatal |
| Sat 23 Aug 1980 | Stevenage | 1 | 1 | Slight |
| Sat 23 Aug 1980 | Stevenage | 1 | 1 | Slight |
| Tue 26 Aug 1980 | East Hertfordshire | 4 | 2 | Serious |
| Sat 6 Sep 1980 | Stevenage | 2 | 2 | Slight |
| Sat 6 Sep 1980 | Stevenage | 2 | 2 | Slight |
| Sat 13 Sep 1980 | East Hertfordshire | 2 | 1 | Serious |
| Thu 25 Sep 1980 | North Hertfordshire | 2 | 1 | Slight |
| Wed 1 Oct 1980 | North Hertfordshire | 2 | 1 | Slight |
| Wed 1 Oct 1980 | Stevenage | 3 | 3 | Slight |
| Wed 1 Oct 1980 | Stevenage | 3 | 3 | Slight |
| Thu 16 Oct 1980 | Stevenage | 1 | 1 | Slight |
| Thu 16 Oct 1980 | North Hertfordshire | 2 | 1 | Slight |
| Thu 16 Oct 1980 | North Hertfordshire | 2 | 1 | Slight |
| Mon 20 Oct 1980 | East Hertfordshire | 2 | 1 | Slight |
| Mon 20 Oct 1980 | East Hertfordshire | 2 | 1 | Slight |
| Mon 27 Oct 1980 | North Hertfordshire | 2 | 1 | Slight |
| Fri 31 Oct 1980 | Stevenage | 1 | 2 | Serious |
| Thu 13 Nov 1980 | Stevenage | 2 | 1 | Slight |
| Thu 13 Nov 1980 | Stevenage | 2 | 1 | Slight |
| Fri 14 Nov 1980 | Stevenage | 2 | 1 | Slight |
| Fri 14 Nov 1980 | Stevenage | 2 | 1 | Slight |
| Sat 15 Nov 1980 | East Hertfordshire | 4 | 1 | Slight |
| Tue 18 Nov 1980 | East Hertfordshire | 1 | 1 | Slight |
| Thu 20 Nov 1980 | North Hertfordshire | 1 | 1 | Serious |
| Thu 20 Nov 1980 | North Hertfordshire | 1 | 1 | Serious |
| Thu 27 Nov 1980 | North Hertfordshire | 1 | 2 | Slight |
| Mon 1 Dec 1980 | Stevenage | 1 | 1 | Slight |
| Mon 1 Dec 1980 | Stevenage | 1 | 1 | Slight |
| Thu 4 Dec 1980 | Stevenage | 1 | 1 | Serious |
| Thu 4 Dec 1980 | Stevenage | 1 | 1 | Serious |
| Mon 15 Dec 1980 | Stevenage | 2 | 1 | Slight |
| Thu 18 Dec 1980 | Stevenage | 1 | 1 | Serious |
| Thu 18 Dec 1980 | Stevenage | 1 | 1 | Serious |
| Fri 19 Dec 1980 | Stevenage | 2 | 1 | Slight |
| Fri 19 Dec 1980 | Stevenage | 2 | 1 | Slight |