Motor vehicle operating data collection and analysis

1. A driving data recorder comprising

an interface to an on-board diagnostic port of a vehicle;

a processing unit comprising a processor; and

a memory unit, wherein the driving data recorder is configured to:

receive, through the interface, vehicle speed data corresponding to a vehicle's movement at regular periodic intervals;

detect an excess speed event when the vehicle speed data passes over a predetermined speed limit;

detect that time of day is after-sunset;

detect that the vehicle is accelerating;

determine, by the processing unit, that the excess speed event occurred both during the after-sunset time of day and during the acceleration of the vehicle;

responsive to the determining that the excess speed event occurred both during the after-sunset time of day and during the acceleration of the vehicle, negatively adjust a safety rating associated with the vehicle of a driver based on a magnitude of the acceleration of the vehicle; and

record, in the memory unit, the adjusted safety rating.

2. The driving data recorder of claim 1 , further comprising a clock configured to detect time of day.

3. The driving data recorder of claim 1 , further comprising a global positioning satellite (GPS) receiver, wherein GPS data generated by the GPS receiver is used to calculate vehicle speed.

4. The driving data recorder of claim 3 , wherein the memory unit stores computer-executable instructions that, when executed by the processing unit, cause the driving data recorder to:

receive, through the interface, the vehicle speed data corresponding to the vehicle's movement at regular periodic intervals;

detect an excess speed event when the vehicle speed data passes over the predetermined speed limit;

detect that the time of day is after-sunset;

detect that the vehicle is accelerating;

determine, by the processing unit, that the excess speed event occurred both during the after-sunset time of day and during the acceleration of the vehicle;

responsive to the determining that the excess speed event occurred both during the after-sunset time of day and during the acceleration of the vehicle, negatively adjust the safety rating associated with the vehicle of the driver based on the magnitude of the acceleration of the vehicle;

record, in the memory unit, the adjusted safety rating;

receive the GPS data corresponding to the vehicle's location;

infer vehicle speed from the GPS data; and

crosscheck integrity of the vehicle speed data against the vehicle speed inferred from the GPS data.

5. A method comprising:

receiving, by a driving data recorder through an on-board diagnostics port of a vehicle, vehicle speed at regular periodic intervals;

recording, by a driving data recorder, the vehicle speed data corresponding to a vehicle's movement at regular periodic intervals;

detecting, by the driving data recorder, an excess speed event when the vehicle speed data passes over a predetermined speed limit;

detecting, by the driving data recorder, that time of day is after-sunset;

determining, by the driving data recorder, that the excess speed event occurred during the after-sunset time of day;

responsive to the determining that the excess speed event occurred during the after-sunset time of day, negatively adjusting a safety rating associated with the vehicle of a driver; and

recording, by the driving data recorder, the adjusted safety rating.

6. The method of claim 5 , further comprising:

detecting, by the driving data recorder, that the vehicle is accelerating;

determining, by the driving data recorder, that the excess speed event occurred during acceleration of the vehicle; and

responsive to the determining that the excess speed event occurred during the acceleration of the vehicle, further adjusting a safety rating associated with a vehicle of a driver based on a magnitude of the acceleration of the vehicle.

7. The method of claim 5 , wherein the driving data recorder is a data collection system comprising electronic memory storage and central processing unit and is configured to interface with an on-board diagnostic port of the vehicle.

8. The method of claim 5 , wherein the vehicle speed data is derived from GPS data.

9. The method of claim 5 , further comprising: uploading the vehicle speed data, by the driving data recorder, to a central server.

10. The method of claim 5 , further comprising: recording, by a clock associated with the driving data recorder, time of day data.

11. The method of claim 5 , further comprising:

determining, by the driving data recorder, a time duration of excess speed events, wherein an excess speed event ends when the vehicle speed data falls below the predetermined speed limit;

determining, by the driving data recorder, a total duration of a trip;

evaluating the excess speed events, by the driving data recorder, based upon the total duration of the trip and a duration of the excess speed events; and

adjusting, by the driving data recorder, the safety rating associated with the vehicle of the driver.

12. The method of claim 5 , further comprising:

receiving, by a global positioning satellite (GPS) receiver in communication with the driving data recorder, GPS data corresponding to the vehicle's location;

inferring, by the driving data recorder, vehicle speed from the GPS data; and

crosschecking, by the driving data recorder, integrity of the vehicle speed data against the vehicle speed inferred from the GPS data.