The very first spaghetti junction; the borders where you must switch which side of the road you drive on; the countries that switched which side of the road everyone drove on; and the arterial road that crosses an airport runway.
Combine three motorways, two railway lines, three canals, two rivers and you get the first junction described as spaghetti.
Cars in some countries drive on the left; cars in other countries drive on the right. At the borders between them, road design has to get creative.
Cars in some countries drive on the left; cars in other countries drive on the right. And sometimes countries decide to switch from one to the other.
The main road into and out of Gibraltar crosses an airport runway.