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Highway map of the internet. BGP doesn't care about the individual local roads just the highways or national roads between cities.
Say you want to get from your place (221B Baker St London) to the Eiffel Tower. BGP doesn't care that you need to take a left at the end of your street then a right after 200m to get onto the highway. BGP cares that in London you get onto the A13 to Dover one in Dover get on the Eurostar to Callie, once at Callie take the E44 to Paris.