While an autonomous mode is activated, a vehicle is operated based on operating parameters for the autonomous mode. The operating parameters include at least one of a vehicle speed or a following distance. Upon detecting a user input to control vehicle operation, vehicle operation is transitioned to a nonautonomous mode, and a count of a number of received user inputs to control vehicle operation is incremented. Upon determining that the count of received of user inputs to control vehicle operation is greater than a threshold, the operating parameters for the autonomous mode are updated. Then, upon determining to transition from the nonautonomous mode to the autonomous mode, the vehicle is operated based on the updated operating parameters.