Randomized Trial on Mobile Technology and Young Drivers' Cellphone Use

The Fleetsafer app, which is a commercial cellphone app that uses a cellphone's standard sensors and function to block handheld cellphone use while driving, will be downloaded on the participant's smartphone.

"Apple's Do Not Disturb driving mode provided by Apple for iPhones or Google Do Not Disturb, Verizon Messages +, Android Auto or have another app, called LifeSaver installed on their Android phone (collectively referred to as driving modes; the specific driving mode for participants in this arm will be determined based on smartphone type and service provider)."