Effects of passenger restrictions on 16 year old drivers: estimated road user lives saved and per cent reductions in annual road user deaths, given different percentages of potential choices by passengers
| Percentage selecting potential choices | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Compliance scenarios | Passenger behaviors | Disobey law | Passengers travel with older drivers | Passengers drive themselves | Passengers forego trips | Lives saved | 95% CI | % Deaths reduced | 95% CI |
| Low | Few obey law | 80 | 10 | 10 | 0 | 48 | 35 to 61 | 8 | 6 to 10 |
| Intermediate | More drive alone | 50 | 10 | 40 | 0 | 110 | 77 to 143 | 18 | 12 to 23 |
| More go with older drivers | 50 | 30 | 20 | 0 | 124 | 92 to 156 | 20 | 15 to 25 | |
| Some forego trips | 50 | 30 | 10 | 10 | 145 | 114 to 177 | 24 | 18 to 29 | |
| High | More drive alone | 30 | 20 | 50 | 0 | 158 | 113 to 204 | 26 | 18 to 33 |
| More go with older drivers | 30 | 40 | 30 | 0 | 173 | 128 to 218 | 28 | 21 to 35 | |
| Some forego trips | 30 | 40 | 20 | 10 | 193 | 149 to 238 | 31 | 24 to 39 | |
| More drive alone | 10 | 40 | 50 | 0 | 214 | 156 to 272 | 35 | 25 to 44 | |
| More go with older drivers | 10 | 60 | 30 | 0 | 228 | 170 to 286 | 37 | 28 to 46 | |
| Some forego trips | 10 | 60 | 20 | 10 | 249 | 191 to 306 | 40 | 31 to 50 | |
| More forego trips | 10 | 60 | 10 | 20 | 269 | 212 to 327 | 44 | 34 to 53 | |
| All ages 16–19 drive alone | 0 | 40 | 60 | 0 | 234 | 170 to 299 | 38 | 28 to 49 | |