Reactivation of driver assist mode

1. A computer, comprising:

a processor and memory storing instructions executable by the processor, the instructions comprising, to:

following a driver-initiated trigger to deactivate a driver assist mode, reactivate the mode when, for a dwelling period, each of a plurality of conditions equal respectively predetermined values,

wherein the plurality of conditions comprise at least two of: a steering wheel rotational rate, a lateral offset, or a driver hand-engagement.

2. The computer of claim 1 , wherein: the rate is +/−15 degrees/second; the offset, with respect to roadway markings, is +/−0.6 meters; and the engagement is detected.

3. The computer of claim 1 , wherein the plurality further comprises at least one of: a closing rate, a longitudinal acceleration, a standard deviation of lateral offset, a heading angle, and a lateral acceleration.

4. The computer of claim 1 , wherein the plurality further comprises at least three of: a closing rate, a longitudinal acceleration, a standard deviation of lateral offset, a heading angle, a lateral acceleration value, and a vehicle speed.

5. The computer of claim 1 , wherein the plurality further comprises each of: a closing rate, a longitudinal acceleration, a standard deviation of lateral offset, a heading angle, a lateral acceleration value, and a vehicle speed.

6. The computer of claim 1 , wherein at least some of the values are within respectively predetermined ranges of values.

7. The computer of claim 1 , wherein the instructions further comprise: prior to determining the plurality, to pause for an interval.

8. The computer of claim 7 , wherein the instructions further comprise, to: receive an indication that a driver does not acknowledge reactivation; and prior to re-determining the plurality, pause for a larger interval.

9. The computer of claim 1 , wherein, in the driver assist mode, the computer controls longitudinal vehicle movement, lateral vehicle movement, or both.

10. A method, comprising:

using a vehicle computer:

detecting a driver-initiated trigger to deactivate a driver assist mode;

determining that a plurality of conditions is TRUE concurrently during a dwell period; and

based on the determination, reactivating the mode,

wherein the plurality of conditions comprise at least two of: a steering wheel rotational rate, a lateral offset with respect to roadway markings, or a driver hand-engagement.

11. The method of claim 10 , wherein each of the plurality are TRUE when a plurality of detected values is within a plurality of respective predetermined ranges.

12. A method, comprising:

using a vehicle computer:

following a driver-initiated trigger to deactivate a driver assist mode, reactivating the mode when, for a dwelling period, each of a plurality of conditions equal respectively predetermined values,

wherein the plurality of conditions comprise at least two of: a steering wheel rotational rate, a lateral offset, or a driver hand-engagement.

13. The method of claim 12 , wherein: the rate is +/−15 degrees/second; the offset, with respect to roadway lane markers, is +/−0.6 meters; and the engagement is detected.

14. The method of claim 12 , wherein the plurality further comprises at least one of: a closing rate, a longitudinal acceleration, a standard deviation of lateral offset, a heading angle, and a lateral acceleration.

15. The method of claim 12 , wherein the plurality further comprises at least three of: a closing rate, a longitudinal acceleration, a standard deviation of lateral offset, a heading angle, a lateral acceleration value, and a vehicle speed.

16. The method of claim 12 , wherein at least some of the values are within respectively predetermined ranges of values.

17. The method of claim 12 , wherein, in the driver assist mode, controlling a longitudinal vehicle movement, a lateral vehicle movement, or both.