The primary objective of this study is to determine whether the app reduces (1) smartphone communication sent from parent to teen while the teen is driving; and (2) smartphone communication sent from teen while the teen is driving. The secondary objectives are to: Determine whether the app reduces smartphone communication sent from teen to parent while parent is driving; Evaluate the acceptability of the app among parents and teens; and determine the relationship between individual differences (demographics, typical smartphone use, driving history, risk perception) and the app's efficacy.
