Ten questions allow the reader to self-assess driving performance in difficult situations (intersections, dense traffic and reversing), incidents of failing to see other road users, experience of fatigue and vision problems when driving, slowing of reactions in critical situations, and negative feedback from the driver’s friends and family, or from other road users. Respondents are recommended to see a doctor if they experience any of the listed problems, and to undergo a detailed assessment of their fitness to drive. As for most self-assessment tools, no scientific evaluation is available. However, one main result of the EU-Project SIZE was that a most important barrier for agreeable outdoor mobility of older persons stems from difficult interaction with (other) car drivers.