An auto-cruise apparatus having a constant vehicle speed controller and a mode
selector is provided. The constant vehicle speed controller controls the vehicle
speed such that the vehicle speed is maintained at the set vehicle speed whether
a preceding vehicle may exist or not. The mode selector selects in accordance with
predetermined operations upon the input means, either a vehicle-to-vehicle distance
control mode in which a travel of the subject vehicle is controlled by the vehicle-to-vehicle
distance controller or a constant vehicle speed control mode in which the travel
is controlled by the constant vehicle speed controller. A travel control by either
the vehicle-to-vehicle distance controller or the constant vehicle speed controller
is performed in accordance with a travel mode that has been selected by the mode selector.
