To Resume A Set Speed

Suppose you set your cruise control at a desired speed with the "SET" button and then you apply the brake. This, of course, shuts off the cruise control. But you do not need to reset it. Once you're going 25 mph (40km/h) or more, you can move the cruise control switch from "ON" to "R/A"(which stands for Resume/Accelerate) for about half a second.

You will go right back up to your chosen speed and stay there.
If you turn the ignition off, or turn cruise switch off, you will erase memory.