Driver assistance system

A driver assistance system comprising:

• an accelerator grip turnably operable by a rider to accelerate or decelerate a vehicle which is a saddle-type vehicle;
• an accelerator sensor that detects a turning operation of the accelerator grip;
• an automated cruise controller that automatically controls a vehicle speed of the vehicle or a following distance on a basis of a set vehicle speed;
• a regulation speed recognizer that recognizes a regulation speed stipulated for a road on which the vehicle is traveling;
• and
• a vehicle speed specifier that, in response to the accelerator sensor detecting an open/close operation of turning the accelerator grip in an opening direction and then in a closing direction while the automated cruise control based on the set vehicle speed is in progress, changes the set vehicle speed on a basis of a recognition result from the regulation speed recognizer, wherein
• the vehicle speed specifier changes the set vehicle speed on a basis of the recognition result in a case where a turning operation in a predetermined approval pattern is detected by the accelerator sensor,
• the vehicle speed specifier maintains the set vehicle speed in a case where a turning operation in a predetermined denial pattern is detected by the accelerator sensor,
• the turning operation in the approval pattern is the open/close operation that is performed a first set number of times within a set time period, and
• the turning operation in the denial pattern is the open/close operation that is performed a second set number of times within the set time period, the second set number of times being greater than the first set number of times.