If the main road running North to South has two-way traffic (and if each side road allows traffic from the East to the West) then there are six possibilities: 2 x 3 = 6.
If the main road is one-way from the North to the South , then depending on the position of the side roads and the direction of their traffic, the answer could be anything from 0 to 6.
If the main road is one-way from the North to the South , then depending on the position of the side roads and the direction of their traffic, the answer could be anything from 0 to 6.