Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Mon 4 Jan 1999 | St. Albans | 1 | 2 | Slight |
| Fri 12 Feb 1999 | North Hertfordshire | 2 | 2 | Slight |
| Sat 20 Feb 1999 | North Hertfordshire | 2 | 1 | Serious |
| Fri 26 Mar 1999 | St. Albans | 2 | 1 | Slight |
| Sun 28 Mar 1999 | St. Albans | 1 | 1 | Slight |
| Sat 1 May 1999 | St. Albans | 2 | 3 | Slight |
| Sun 2 May 1999 | North Hertfordshire | 1 | 1 | Serious |
| Wed 30 Jun 1999 | St. Albans | 2 | 1 | Slight |
| Fri 23 Jul 1999 | St. Albans | 2 | 1 | Slight |
| Thu 26 Aug 1999 | North Hertfordshire | 2 | 1 | Slight |
| Sun 19 Sep 1999 | St. Albans | 2 | 1 | Slight |
| Mon 25 Oct 1999 | North Hertfordshire | 4 | 1 | Slight |
| Mon 25 Oct 1999 | St. Albans | 2 | 2 | Slight |
| Thu 25 Nov 1999 | St. Albans | 1 | 1 | Slight |
| Sun 28 Nov 1999 | St. Albans | 2 | 2 | Serious |
| Mon 29 Nov 1999 | St. Albans | 2 | 1 | Slight |
| Wed 8 Dec 1999 | North Hertfordshire | 2 | 2 | Slight |
| Thu 23 Dec 1999 | St. Albans | 2 | 1 | Slight |