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A green plate carrying a letter and a number.
Also known as: Expressway numbering Japan, E-number Japan
Identifies a Japanese expressway by a letter-and-number code introduced to make the network navigable without Japanese.
Identifies an expressway route by its letter-and-number code.
Contexts: Road signage
Was introduced across the network from 2017, principally so that a driver who cannot read the route's Japanese name can still follow it; the codes were assigned to existing roads rather than replacing their names, so most expressways now carry both.
Contexts: Road signage
A rounded rectangle in a solid tone carrying a capital letter followed by a numeral in a contrasting tone.