Do you remember how it felt the very first time you engaged cruise
control? That momentary sense of no longer being in control, that the
car had assumed command? That's how Toyota's new crawl mode in the
2008 Land Cruiser feels at first. You select the function, take your
foot off the brake, and the car proceeds under its own management.

Of course, in crawl mode (which functions only in low range) the new
Cruiser moves forward very slowly-there are three speed choices on a
rotary switch in the dash, and none of them is faster than a walking
pace. The cool trick is that the vehicle will maintain that pace
through thick and thin, adding power to get the truck over big moguls
and using the traction control and downhill assist to negotiate holes
and grades. All you need to do is steer.
full article here
http://www.zone-car.com/?2008-toyota-land-cruiser.php