Method and apparatus for navigation accommodating train crossings

1. A system comprising:

a processor configured to:

access a train schedule to determine active train crossings along an original route, based on a predicted vehicle-arrival time at a given crossing;

determine that a driver identity has an avoidance parameter associated therewith;

determine a new route avoiding active train crossings, if possible, responsive to the avoidance parameter and determination of at least one active train crossing along the original route; and

engage active train-crossing safety controls when a vehicle approaches within a threshold distance of an active train crossing.

2. The system of claim 1 , wherein the active safety controls include automatically braking a vehicle prior to the vehicle entering an active train crossing, and preventing movement until a train has cleared the crossing.

3. The system of claim 1 , wherein the active safety controls include automatically braking a vehicle prior to the vehicle entering an active train crossing, and preventing movement until the processor determines existing clearance sufficient to fit the vehicle on a far side of a train crossing.

4. The system of claim 3 , wherein the processor is configured to determine existing clearance based on wireless data received from a vehicle on the far side of the train crossing.

5. The system of claim 3 , wherein the processor is configured to determine existing clearance based on vehicle sensor data indicating the clearance through lack of detected impediment.

6. A system comprising:

a processor configured to:

determine that a current travel path includes an active train crossing based on expected train presence time;

determine that a vehicle is within a braking threshold distance from the active train crossing; and

automatically brake the vehicle, preventing forward movement of the vehicle until a train has cleared the train crossing, responsive to the vehicle being within the braking threshold distance.

7. The system of claim 6 , wherein the braking threshold distance varies based on impediments detected, by a vehicle sensor, between the vehicle and a train crossing location.

8. The system of claim 6 , wherein the processor is configured to determine that the train has cleared the train crossing based on a vehicle sensor.

9. The system of claim 6 , wherein the processor is configured to determine that the train has cleared the train crossing based on a received wireless indicator that the train has cleared the train crossing.

10. The system of claim 6 , wherein the processor is configured to:

determine that the vehicle is within a warning threshold distance from the active train crossing; and

engage a driver warning, responsive to determining that the vehicle is within the warning distance, wherein the warning varies in intensity inversely with vehicle distance from the active train crossing, and wherein the warning persists until the train clears the train crossing.

11. The system of claim 10 , wherein the warning diminishes in intensity, including temporarily ceasing, when a vehicle stops moving prior to the train clearing the crossing.

12. A computer-implemented method comprising:

determining, via a vehicle computer or a remote computer in communication with the vehicle computer, that a vehicle is within a threshold distance of an active train crossing, where a train is projected to arrive no later than a threshold time from a present time; and preventing the vehicle from entering a region defining a likely-impact region, responsive to the determining that the vehicle is within the threshold distance, until the vehicle computer determines that the train has cleared the crossing.