The setting is based on time, not distance, and the time intervals aren't defined explicitly. Here's the relevant paragraph in the owners manual: "Since each gap setting corresponds to a following time (Far, Medium, or Near), the following distance will vary based on vehicle speed. The faster the vehicle speed, the further back your vehicle will follow a vehicle detected ahead. Consider traffic and weather conditions when selecting the following gap. The range of selectable gaps may not be appropriate for all drivers and driving conditions." Sent from my LM-V350 using Tapatalk