Dual-lane and Four-lane

Dual-lane adjective - Having a median strip or island between lanes of traffic moving in opposite directions.

Four-lane and dual-lane are semantically related. In some cases you can use "Four-lane" instead an adjective phrase "Dual-lane".

Four-lane adjective - Having two lanes for traffic in each direction.

Dual-lane and four-lane are semantically related. You can use "Dual-lane" instead an adjective phrase "Four-lane".