Smartphone-paired Breathalyzers and Loss- and Gain-framed Texts for Reducing Drinking and Driving

Inclusion Criteria: * Between the ages of 21-39 * Reports an average of one heavy drinking day (men more than five drinks, women more than four drinks) per week over the preceding 8 weeks * Has a valid photo identification (ID) * Are willing and able to use an Uber or Lyft or septa as transportation home * Drives four or more trips per week * Owns an Apple iPhone or Android smartphone Exclusion Criteria: * Desire for alcohol treatment now or have received alcohol treatment within the past 6 months * Alcohol use disorder rated as severe per DSM-V criteria * Non-English-speaking * Women who are pregnant * Individuals who should not consume alcohol due to a medical condition such as liver disease, cancer, and seizure disorders. Participants will be asked to answer yes if they have any disorder that their doctor has suggested that they should not drink alcohol. If they are unsure or say I don't know the investigators will ask them to speak with their doctor prior to participation.