Effects of passenger restrictions on drivers ages 16–17: 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 | 83 | 68 to 98 | 7 | 6 to 8 |
| Intermediate | More drive alone | 50 | 10 | 40 | 0 | 183 | 142 to 223 | 15 | 12 to 19 |
| More go with older drivers | 50 | 30 | 20 | 0 | 216 | 178 to 254 | 18 | 15 to 21 | |
| Some forego trips | 50 | 30 | 10 | 10 | 263 | 226 to 300 | 22 | 19 to 25 | |
| High | More drive alone | 30 | 20 | 50 | 0 | 266 | 210 to 321 | 23 | 18 to 27 |
| More go with older drivers | 30 | 40 | 30 | 0 | 299 | 245 to 352 | 25 | 21 to 30 | |
| Some forego trips | 30 | 40 | 20 | 10 | 346 | 294 to 398 | 29 | 25 to 34 | |
| More drive alone | 10 | 40 | 50 | 0 | 365 | 296 to 434 | 31 | 25 to 37 | |
| More go with older drivers | 10 | 60 | 30 | 0 | 398 | 329 to 467 | 34 | 28 to 40 | |
| Some forego trips | 10 | 60 | 20 | 10 | 446 | 378 to 513 | 38 | 32 to 43 | |
| More forego trips | 10 | 60 | 10 | 20 | 493 | 426 to 560 | 42 | 36 to 47 | |
| All ages 16–19 drive alone | 0 | 40 | 60 | 0 | 398 | 321 to 476 | 34 | 27 to 40 | |