Enumerate the lane directions.
enum{
ITC_RELA_LANE_DIRECTION_UNKNOW = 0,
ITC_RELA_LANE_EAST_WEST = 1,
ITC_RELA_LANE_WEST_EAST = 2,
ITC_RELA_LANE_SOUTH_NORTH = 3,
ITC_RELA_LANE_NORTH_SOUTH = 4,
ITC_RELA_LANE_EASTSOUTH_WESTNORTH = 5,
ITC_RELA_LANE_WESTNORTH_EASTSOUTH = 6,
ITC_RELA_LANE_EASTNORTH_WESTSOUTH = 7,
ITC_RELA_LANE_WESTSOUTH_EASTNORTH = 8
}ITC_RELA_LANE_DIRECTION_TYPE
Other
From east to west.
From weat to east.
From south to north.
From north to south.
From southeast to northwest.
From northwest to southeast.
From northeast to southwest.
From southwest to northeast.