California | 1983 | 3.8 | | 5 | 1 mth + 2 wk; more for test failures | Hagge and Marsh16 |
California | 1998 | 0 | | 9 | 6 mth | Peck (unpublished) |
California: San Diego | 1998 | 0 | | 20 | 6 mth | Smith et al6 |
Connecticut | 1997 | | | 22 | 3–6 mth | Ulmer et al18 |
Florida | 1996 | | 9 | | 6 mth | Ulmer et al24 |
Kentucky | 1998 | | | 32 | 180 days | Agent et al15 |
Louisiana | 1993 | | | 20 | Driver education | Ulmer et al17 |
Michigan | 1997 | | | 25 | 50 h | Shope et al14 |
Ohio | 1999 | 11 | | 11 | 6 mth | Kilgore7 |
New Zealand | 1987 | | | 7 | 6 mth | Langley et al12 |
North Carolina | 1997 | | | 27 | 12 mth | Foss23 |
Nova Scotia | 1994 | | | 24 | 6 mth | Mayhew et al19 |
Ontario | 1994 | 16 | 31 | | 12 mth | Boase and Tasca4 |
Quebec | 1996 | 5 | 14 | | 8–12 mth | Bouchard et al5 |