Function CheckLevelCrossing

src/train_cmd.cpp:1756–1760

* Check if a level crossing should be barred. * @param tile The tile to check. * @return True if the crossing should be barred, else false. */

 * @return True if the crossing should be barred, else false.
 */
static inline bool CheckLevelCrossing(TileIndex tile)
{
	/* reserved || train on crossing || train approaching crossing */
	return HasCrossingReservation(tile) || TrainOnCrossing(tile) || TrainApproachingCrossing(tile);
}

/**
 * Sets a level crossing tile to the correct state.