Road size includes both height and width.
Answer 2 is incorrect because there is only width, answer 3 is incorrect because there is only height.
A space with limited dimensions in terms of height and width of roads, bridges, ferries, tunnels for vehicles including goods loaded on vehicles to pass safely.
A space with a limited size on the width of roads, bridges, ferry terminals, tunnels on roads that can be safely passed through by vehicles including goods loaded on vehicles
A space with a limited size on the height of bridges, ferry terminals, tunnels on the road for vehicles to pass safely.