Honda Civic 2017 Owner's Manual page 486

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
When your vehicle stops automatically because a vehicle detected ahead of you has
stopped, the interval between the two vehicles will vary based on the ACC with Low
Speed Follow interval setting.
When the Set Speed is:
80 km/h 104 km/h
24.7 metres 31.5 meters
1.1 sec
34.2 metres 43.4 meters
1.5 sec
46.8 metres 60.8 meters
2.1 sec
63.5 metres 83.4 metres
2.9 sec
uuHonda Sensing * uAdaptive Cruise Control (ACC) with Low Speed Follow
1To Set or Change Following-interval
The driver must in all circumstances preserve a
sufficient braking distance from the vehicle which
precedes it and be aware that minimum distances or
times of spacing can be provided by the provisions of
the Motorway Code locally applicable and that it is
the driver's responsibility to respect those laws.
1.1 sec
1.5 sec
2.1 sec
2.9 sec
Continued 485