(that ultimately sped up).
I hate it when people do that.
I'll be sitting on TACC the entire time doing the same speed, and throughout some long drive I'll pass a person multiple times because they do the whole speed up and slow down thing.
Where I'm like "would you go away already"
FYI - You probably already know this, but if you use TACC only you can easily hit the accelerator to pass someone then let off. You never have to remove it out of TACC unless you have to brake.