Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Fri 26 Jan 1979 | Brent | 1 | 1 | Slight |
| Sat 27 Jan 1979 | Watford | 2 | 1 | Slight |
| Sat 27 Jan 1979 | Watford | 2 | 1 | Slight |
| Sat 27 Jan 1979 | Hertsmere | 2 | 2 | Slight |
| Sat 10 Mar 1979 | Watford | 2 | 1 | Slight |
| Sat 10 Mar 1979 | Watford | 2 | 1 | Slight |
| Mon 12 Mar 1979 | Hertsmere | 2 | 1 | Slight |
| Sat 17 Mar 1979 | Three Rivers | 1 | 1 | Slight |
| Sat 17 Mar 1979 | Three Rivers | 1 | 1 | Slight |
| Thu 29 Mar 1979 | Hertsmere | 1 | 1 | Serious |
| Fri 6 Apr 1979 | Brent | 3 | 2 | Slight |
| Fri 6 Apr 1979 | Three Rivers | 1 | 2 | Serious |
| Fri 13 Apr 1979 | Three Rivers | 2 | 2 | Serious |
| Sat 14 Apr 1979 | Hertsmere | 2 | 1 | Slight |
| Tue 1 May 1979 | Brent | 1 | 1 | Serious |
| Fri 18 May 1979 | Three Rivers | 2 | 4 | Serious |
| Fri 18 May 1979 | Watford | 2 | 1 | Slight |
| Fri 18 May 1979 | Watford | 2 | 1 | Slight |
| Fri 25 May 1979 | Hertsmere | 2 | 1 | Slight |
| Sat 2 Jun 1979 | Watford | 1 | 1 | Slight |
| Sat 2 Jun 1979 | Watford | 1 | 1 | Slight |
| Sun 10 Jun 1979 | Hertsmere | 2 | 1 | Slight |
| Mon 11 Jun 1979 | Hertsmere | 2 | 1 | Slight |
| Tue 12 Jun 1979 | Hertsmere | 1 | 1 | Slight |
| Fri 15 Jun 1979 | Harrow | 4 | 3 | Slight |
| Wed 20 Jun 1979 | Hertsmere | 2 | 1 | Slight |
| Sun 24 Jun 1979 | Harrow | 2 | 1 | Slight |
| Tue 3 Jul 1979 | Hertsmere | 1 | 1 | Serious |
| Wed 11 Jul 1979 | Hertsmere | 1 | 1 | Slight |
| Sat 4 Aug 1979 | Three Rivers | 1 | 1 | Slight |
| Mon 6 Aug 1979 | Harrow | 1 | 1 | Slight |
| Sat 25 Aug 1979 | Hertsmere | 2 | 1 | Slight |
| Sun 26 Aug 1979 | Brent | 2 | 2 | Slight |
| Wed 12 Sep 1979 | Three Rivers | 2 | 3 | Serious |
| Wed 12 Sep 1979 | Three Rivers | 2 | 3 | Serious |
| Thu 13 Sep 1979 | Watford | 1 | 1 | Slight |
| Thu 13 Sep 1979 | Watford | 1 | 1 | Slight |
| Fri 14 Sep 1979 | Hertsmere | 3 | 1 | Slight |
| Sat 15 Sep 1979 | Hertsmere | 2 | 1 | Slight |
| Thu 20 Sep 1979 | Hertsmere | 1 | 1 | Slight |
| Fri 21 Sep 1979 | Hertsmere | 2 | 1 | Slight |
| Mon 24 Sep 1979 | Three Rivers | 2 | 1 | Slight |
| Mon 24 Sep 1979 | Three Rivers | 2 | 1 | Slight |
| Sat 27 Oct 1979 | Harrow | 2 | 1 | Slight |
| Sat 3 Nov 1979 | Hertsmere | 2 | 1 | Slight |
| Mon 5 Nov 1979 | Hertsmere | 2 | 2 | Slight |
| Sun 11 Nov 1979 | Three Rivers | 1 | 1 | Slight |
| Tue 20 Nov 1979 | Harrow | 2 | 1 | Slight |
| Fri 23 Nov 1979 | Hertsmere | 2 | 1 | Slight |
| Sun 25 Nov 1979 | Hertsmere | 1 | 1 | Slight |
| Sat 1 Dec 1979 | Hertsmere | 2 | 1 | Slight |
| Thu 6 Dec 1979 | Hertsmere | 2 | 1 | Serious |
| Sat 15 Dec 1979 | Harrow | 4 | 3 | Slight |
| Wed 19 Dec 1979 | Hertsmere | 1 | 1 | Serious |