Yes, leewan . . . but have you ever been at an airport that's covered with fresh snow? Have you ever operated from, or seen an active contaminated runway where you can't see the runway markings, nor the associated taxiway markings; and where the signposts and edge lights are obscured? Have you ever seen, or operated from a runway or taxiway that had not yet been ploughed to its full width? Have you ever seen freshly ploughed snow banks covering the edge lights?
Nope, never been to a snow covered airport, let alone a cold climate country. I was trying to put myself in the pilot's shoes from WHAT I've seen. Didn't realize that snow covered airports had different taxiway and runway markings. Out of curiosity, does this airport have airport ground radar to assist the ATC in knowing the a/c's location in the airport ?