Gershon P, et al. - Researchers collected objective driving data in a naturalistic cohort study of 90 adolescent drivers with learner driving permit and 131 experienced adult drivers to test the variability in measures of driving risk among adolescents during the learner and early independent driving periods and assess how risk varies by driving experience, gender, time of day, and road surface conditions. They found that the transition to independent driving was typified by a dramatic increase in risk among adolescents that was higher than adult rates overall and under varying driving conditions while the learner driving period was relatively harmless for adolescents. It was noted that adolescent kinematic risky driving (KRD) rates were higher for males than females and invariably higher than adult rates during day and night, wet and dry conditions.