If you drive at 56 mph (90 km/h), the distance is maintained as follows:

Distance 4 - approximately 172 ft. (52.5 m)

Distance 3 - approximately 130 ft. (40 m)

Distance 2 - approximately 106 ft. (32.5 m)

Distance 1 - approximately 82 ft. (25 m)

The distance is set to the last set distance when the vehicle is restarted, or when Smart Cruise Control was temporarily canceled.