A method of cruise control whereby a following vehicle can be caused to travel at a target speed, subject to maintaining a pre-determined distance from a leading vehicle in substantially straight travel, the method comprising: determining by means of measuring means a separation distance of the leading vehicle and following vehicle and maintaining the pre-determined separation distance from the leading vehicle; determining by means of deviation detection means a deviation of the leading vehicle from a substantially straight path and an instant location of the deviation; and preventing automatic acceleration of the following vehicle until reaching said instant location in dependence on the detection of a deviation.