the.com/arterial
The body's highways and the city's, both built so traffic never stops moving.
means Relating to arteries, or describing a main route that carries the heaviest flow of traffic.
from From Greek arteria, which ancient anatomists wrongly thought carried air, not blood — found empty in corpses, since arteries drain after death.
Dead giveawayNamed for air because corpse arteries lie empty.
Color codeArterial blood runs bright red, oxygen-rich.
Roads tooArterial streets feed traffic into smaller side roads.