The Advancing Understanding of Transportation Options (AUTO) study: design and methods of a multi-center study of decision aid for older drivers.BACKGROUND
 The Advancing Understanding of Transportation Options (AUTO) study is a multi-site, two-armed randomized controlled trial that will test the impact of a decision aid on older adults' decisions about changes in driving behaviors and cessation.  AUTO will enroll 300 drivers age ≥ 70 years with a study partner (identified by each driver); the dyads will be randomized into two groups (n = 150/group).  The AUTO trial will compare the effect of the decision aid, versus control, on  The AUTO study is the first large-scale randomized trial of a driving decision aid for older adults. 
AUTO
The decision aid group will view the web-based decision aid created by Healthwise at baseline and the control group will review information about driving that does not include evidence-based elements on risks and benefits and values clarification about driving decisions. 
Healthwise
a) immediate decision quality (measured by the Decisional Conflict Scale; primary outcome); 
Decisional Conflict Scale