| 摘要 |
<p>When a preceding vehicle in a driving lane is adequately caught in sight, a target vehicle speed is calculated by a calculated value based on an adequate vehicle-to-vehicle distance to the preceding vehicle, and it is checked whether or not a gradient for determining whether the road on which the vehicle is running on a downhill road or an uphill road should be performed. If it is determined that the road is a downhill road or an uphill road, the target vehicle speed is corrected according to the gradient. The indicated vehicle speed and the actual speed are adequately adjusted according to the road gradient, and an adequate vehicle-to-vehicle distance to the preceding vehicle is maintained to realize a consistent follow running.
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