Acura RDX 2019 Owner's Manual page 468

uuAcuraWatch TM uAdaptive Cruise Control (ACC) with Low Speed Follow (LSF)
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 LSF
interval setting.
466
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
207 feet
63 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
272 feet
83 meters
2.9 sec