Acura 2008 RL Owner's Manual page 288

Adaptive Cruise Control (ACC)
Improper use of ACC can lead
to a crash.
Use ACC only when traveling
on open highways in good
weather.
282
Operating Characteristics
When there is no vehicle ahead within
ACC range
Your vehicle will maintain a set
cruising speed.
When a vehicle ahead is within ACC
range and going slower than your set
speed
If the vehicle ahead of you is going
slower than your set speed, your
vehicle will slow down to the speed
of that vehicle. Your vehicle will then
follow at a constant distance until the
vehicle ahead changes speed again.