city road; municipal road
A road managed by a city or municipality, distinct from national or prefectural roads.
This city road is designated as a school route.
the way of trade; the pursuit of profit
Figurative use referring to commerce or profit-seeking, often in contrast to ideals or public good.
When politicians pursue profit, the public interest suffers.
A city road runs through this residential area.
The city drew up a plan to repair the aging city roads.
This road was designated a city road last year.
県道 is a prefectural road managed by a prefecture, one administrative level above 市道.
Compound of 市 (city) and 道 (road). The figurative sense derives from the idea of the marketplace as a path of commerce.