Function IsSignalPresent

src/rail_map.h:403–406

* Checks whether the given signals is present * @param t the tile to check on * @param signalbit the signal * @return true if and only if the signal is present */

 * @return true if and only if the signal is present
 */
inline bool IsSignalPresent(Tile t, uint8_t signalbit)
{
	return HasBit(GetPresentSignals(t), signalbit);
}

/**
 * Checks for the presence of signals (either way) on the given track on the