2+1 road

(transport) A three-lane road with two lanes in one direction and one lane in the other.

Japanese Meaning

片側に2車線、反対側に1車線が配された計3車線の道路

The rural municipality installed a new 2+1 road to improve traffic flow and reduce accidents.

地方自治体は交通の流れを改善して事故を減らすために、片側2車線・反対側1車線の三車線道路を新設しました。

Sense（1）

(transport) A three-lane road with two lanes in one direction and one lane in the other.

2+1 roads

（ plural ）