六车道，双向4车道为机动车道，其余2道为非机动车道。英文该怎么说？地道噢。

As to six-lane, two-way four-lane is the driveway, and the others are the non-driveways.
或
As to six-lane, two-way four-lane is the roadway, and the others are the non-roadways.

几车道用数字-lane，就好了，lane不用复数。

Six Vehicle lanes, two ways four lanes are meant for motor-vehicles, the other two lanes are meant for non motor-vehicles.

six-lane highway, of which the dual-way four-lane are for motorized vehicles, the rest two lanes are for non-motorized vehicles