I looked at Warsaw and it also looks off. The "main" grid in Warsaw is the tilted one, which the article shows as secondary. There are very few streets in Warsa

I looked at Warsaw and it also looks off. The "main" grid in Warsaw is the tilted one, which the article shows as secondary. There are very few streets in Warsaw that are pure N/S and E/W. I guess this might be an artifact due to some missing data?