Vehicle traveling control apparatus

1. A vehicle traveling control apparatus applied to a vehicle comprising:

circuitry configured to

monitor whether or not a driver of said vehicle is in an abnormal state where said driver loses an ability to drive said vehicle;

decelerate said vehicle to automatically stop said vehicle after a conclusive abnormality determination time point which is a time point when said circuitry finalizes a determination that said driver is in said abnormal state;

determine whether or not said vehicle is in a deceleration prohibition situation based on at least one set of self-vehicle information on a traveling state of said vehicle, information on a vehicle speed of another vehicle traveling around said vehicle, information on a speed limit of a road on which said vehicle is traveling, information on weather condition around said vehicle, and information on a road surface condition of said road on which said vehicle is traveling; and

prohibit said deceleration of said vehicle when it is determined that said vehicle is in said deceleration prohibition situation.

2. The vehicle traveling control apparatus according to claim 1 , wherein said circuitry is configured to:

start said deceleration of said vehicle from a tentative abnormal determination time point which is a time point at which it is determined that said driver is likely to be in said abnormal state by said circuitry and which is prior to said conclusive abnormal determination time point; and

prohibit said deceleration of said vehicle when it is determined that said vehicle is in said deceleration prohibition situation in a period after said tentative abnormality determination time point.

3. The vehicle traveling control apparatus according to claim 1 , wherein said circuitry is configured to:

acquire a vehicle speed of said vehicle as said self-vehicle information; and

determine whether or not said vehicle speed acquired as said self-vehicle information is higher than a threshold self-vehicle speed to determine whether or not said vehicle is in said deceleration prohibition situation.

4. The vehicle traveling control apparatus according to claim 1 , wherein said vehicle is provided with a cruise control apparatus which controls a vehicle speed of said vehicle in such a manner that a vehicle speed of said vehicle becomes equal to a target vehicle speed set by said driver, and

wherein said circuitry is configured to acquire said vehicle speed of said vehicle and said target vehicle speed which has been set most recently as said self-vehicle information, and to determine whether or not said vehicle speed of said vehicle is higher than said target vehicle speed which has been set most recently, to determine whether or not said vehicle is in said deceleration prohibition situation.

5. The vehicle traveling control apparatus according to claim 1 , wherein said circuitry is configured to determine whether or not said vehicle speed of another vehicle is higher than a threshold another vehicle speed to determine whether or not said vehicle is in said deceleration prohibition situation.

6. The vehicle traveling control apparatus according to claim 1 , wherein said vehicle is provided with a cruise control apparatus which controls a vehicle speed of said vehicle in such a manner that said vehicle speed of said vehicle becomes equal to a target vehicle speed set by said driver, and

wherein said circuitry is configured to acquire said target vehicle speed as said information on said speed limit, and to determine whether or not said target vehicle speed is higher than a threshold target vehicle speed, to determine whether or not said vehicle is in said deceleration prohibition situation.

7. The vehicle traveling control apparatus according to claim 1 , wherein said vehicle is provided with a navigation device having information on said speed limit of said road on which said vehicle is traveling, and

wherein said circuitry is configured to acquire said speed limit as said information on said speed limit from said navigation device, and to determine whether or not said acquired speed limit is higher than a threshold speed limit, to determine whether or not said vehicle is in said deceleration prohibition situation.

8. The vehicle traveling control apparatus according to claim 1 , wherein said vehicle is provided with a communication device configured to be capable of receiving information on said speed limit of said road on which said vehicle is traveling from an external device of said vehicle, and

wherein said circuitry is configured to acquire said speed limit as said information on said speed limit from said communication device, and to determine whether or not said acquired speed limit is higher than a threshold speed limit, to determine whether or not said vehicle is in said deceleration prohibition situation.

9. The vehicle traveling control apparatus according to claim 1 , wherein said vehicle is provided with an imaging device which acquires image data by photographing a peripheral region of said vehicle, and

wherein said circuitry is configured to extract said speed limit indicated by a road sign included in said image data as said information on said speed limit, and to determine whether or not said extracted speed limit is higher than a threshold speed limit, to determine whether or not said vehicle is in said deceleration prohibition situation.

10. The vehicle traveling control apparatus according to claim 1 , wherein said vehicle is provided with a rainfall information acquiring device which acquires rainfall information indicating whether or not the weather condition around said vehicle is rainy, and

wherein said circuitry is configured to determine whether or not said weather condition around said vehicle is rainy based on said rainfall information, to determine whether or not said vehicle is in said deceleration prohibition situation.

11. The vehicle traveling control apparatus according to claim 1 , wherein said vehicle is provided with a dense fog information acquiring device which acquires dense fog information indicating whether or not the weather condition around said vehicle is densely foggy, and

wherein said circuitry is configured to determine whether or not said weather condition around said vehicle is densely foggy based on said dense fog information, to determine whether or not said vehicle is in said deceleration prohibition situation.

12. The vehicle traveling control apparatus according to claim 1 , wherein said vehicle is provided with a road surface μ acquiring device which acquires a road surface friction coefficient of said road on which said vehicle is traveling, and

wherein said circuitry is configured to acquire said road surface friction coefficient as said information on said road surface condition of said road on which said vehicle is traveling from road surface μ acquiring device, and to determine whether or not said road surface friction coefficient is smaller than a threshold road surface friction coefficient, to determine whether or not said vehicle is in said deceleration prohibition situation.