_Don't have license (which only applies for those above 18)
_Lack of driving experience [to avoid crash and other hazard on the road]
_Young drivers are more likely to drive in risky ways: too fast, too close to the vehicle in front and dangerous overtaking
_ Statistically young drivers are more likely to be involved in an accident than older
Example: Young drivers, especially men, who carry friends / peers are more likely to have a crash.