Honda Civic Hatch 2017 Owner's Manual page 492

uuWhen DrivinguAdaptive Cruise Control (ACC)
The higher your vehicle's following-speed is, the longer the short, middle, long or
extra long following-interval becomes. See the following examples for your
reference.
Following-interval
Short
Middle
Long
Extra
Long
490
*
When the Set Speed is:
50 mph (80 km/h) 65 mph (104 km/h)
83 feet
25 meters
1.1 sec
110 feet
33 meters
1.5 sec
154 feet
47 meters
2.1 sec
213 feet
65 meters
2.9 sec
100 feet
31 meters
1.1 sec
137 feet
42 meters
1.5 sec
200 feet
61 meters
2.1 sec
282 feet
86 meters
3.0 sec