is_character_not_specialized_in_terrain

is_character_not_specialized_in_terrain = { #Used in character scope
	save_temporary_scope_as = character_in_terrain
	is_location_valid_for_travel_event_on_land = yes
	location = { #Is it reasonable for us to get lost, etc in this type of terrain?
		switch = {
			trigger = terrain
			jungle = {
				scope:character_in_terrain = {
					NOT = { has_trait = jungle_stalker }
					current_travel_plan.travel_leader ?= {
						NOT = { has_trait = jungle_stalker }
					}
				}
			}
			desert = {
				scope:character_in_terrain = {
					NOT = { has_trait = desert_warrior }
					current_travel_plan.travel_leader ?= {
						NOT = { has_trait = desert_warrior }
					}
				}
			}
			drylands = {
				scope:character_in_terrain = {
					NOT = { has_trait = desert_warrior }
					current_travel_plan.travel_leader ?= {
						NOT = { has_trait = desert_warrior }
					}
				}
			}
			desert_mountains = {
				scope:character_in_terrain = {
					NOT = { has_trait = desert_warrior }
					current_travel_plan.travel_leader ?= {
						NOT = { has_trait = desert_warrior }
					}
				}
			}
			oasis = {
				scope:character_in_terrain = {
					NOT = { has_trait = desert_warrior }
					current_travel_plan.travel_leader ?= {
						NOT = { has_trait = desert_warrior }
					}
				}
			}
			mountains = {
				scope:character_in_terrain = {
					NOT = { has_trait = desert_warrior }
					current_travel_plan.travel_leader ?= {
						NOT = { has_trait = desert_warrior }
					}
				}
			}
			wetlands = {
				scope:character_in_terrain = {
					NOT = { has_trait = desert_warrior }
					current_travel_plan.travel_leader ?= {
						NOT = { has_trait = desert_warrior }
					}
				}
			}
			hills = {
				scope:character_in_terrain = {
					NOT = { has_trait = desert_warrior }
					current_travel_plan.travel_leader ?= {
						NOT = { has_trait = desert_warrior }
					}
				}
			}
			farmlands = {
				scope:character_in_terrain = {
					NOT = { has_trait = open_terrain_expert }
					current_travel_plan.travel_leader ?= {
						NOT = { has_trait = open_terrain_expert }
					}
				}
			}
			plains = {
				scope:character_in_terrain = {
					NOT = { has_trait = open_terrain_expert }
					current_travel_plan.travel_leader ?= {
						NOT = { has_trait = open_terrain_expert }
					}
				}
			}
			steppe = {
				scope:character_in_terrain = {
					NOT = { has_trait = open_terrain_expert }
					current_travel_plan.travel_leader ?= {
						NOT = { has_trait = open_terrain_expert }
					}
				}
			}
			forest = {
				scope:character_in_terrain = {
					NOT = { has_trait = forest_fighter }
					current_travel_plan.travel_leader ?= {
						NOT = { has_trait = forest_fighter }
					}
				}
			}
			taiga = {
				scope:character_in_terrain = {
					NOT = { has_trait = forest_fighter }
					current_travel_plan.travel_leader ?= {
						NOT = { has_trait = forest_fighter }
					}
				}
			}
		}
	}
}

As written in game/common/scripted_triggers/00_travel_triggers.txt.