Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Fri 1 Jan 1999 | East Hertfordshire | 1 | 1 | Serious |
| Sun 3 Jan 1999 | East Hertfordshire | 1 | 1 | Slight |
| Mon 4 Jan 1999 | East Hertfordshire | 2 | 1 | Slight |
| Mon 11 Jan 1999 | East Hertfordshire | 1 | 1 | Slight |
| Fri 19 Feb 1999 | East Hertfordshire | 3 | 1 | Slight |
| Sat 27 Feb 1999 | East Hertfordshire | 2 | 1 | Slight |
| Thu 29 Apr 1999 | East Hertfordshire | 2 | 1 | Slight |
| Tue 4 May 1999 | East Hertfordshire | 2 | 1 | Slight |
| Sat 8 May 1999 | East Hertfordshire | 1 | 3 | Slight |
| Sun 9 May 1999 | East Hertfordshire | 3 | 1 | Slight |
| Thu 13 May 1999 | East Hertfordshire | 2 | 1 | Slight |
| Thu 13 May 1999 | East Hertfordshire | 1 | 1 | Slight |
| Mon 17 May 1999 | East Hertfordshire | 2 | 1 | Slight |
| Sun 23 May 1999 | East Hertfordshire | 3 | 1 | Slight |
| Fri 28 May 1999 | East Hertfordshire | 2 | 1 | Slight |
| Mon 31 May 1999 | East Hertfordshire | 1 | 1 | Serious |
| Wed 21 Jul 1999 | East Hertfordshire | 1 | 1 | Slight |
| Thu 19 Aug 1999 | East Hertfordshire | 2 | 1 | Slight |
| Fri 3 Sep 1999 | East Hertfordshire | 1 | 1 | Serious |
| Tue 14 Sep 1999 | East Hertfordshire | 3 | 2 | Slight |
| Fri 15 Oct 1999 | East Hertfordshire | 3 | 1 | Slight |
| Mon 1 Nov 1999 | East Hertfordshire | 2 | 1 | Slight |
| Mon 22 Nov 1999 | East Hertfordshire | 1 | 2 | Slight |
| Thu 25 Nov 1999 | East Hertfordshire | 2 | 1 | Slight |
| Tue 30 Nov 1999 | East Hertfordshire | 1 | 1 | Slight |
| Fri 24 Dec 1999 | East Hertfordshire | 1 | 1 | Slight |