road

function dig(width, height)
    local x = 0
    local y = 0

    while(y < height) do

        while(x < width - 1) do
            turtle.dig()
            turtle.forward()
            x = x + 1
        end

        turtle.digUp()
        turtle.up()
        turtle.turnLeft()
        turtle.turnLeft()
        y = y + 1
        x = 0
    end

    if(height % 2 > 0) then
        while(x > 0) do
            turtle.back()
            x = x - 1
        end
        turtle.turnLeft()
    else
        turtle.turnRight()
    end
    while(y > 0) do
        turtle.down()
        y = y - 1
    end

end

print("Height?")
local height = tonumber(read())
print("Width?")
local width = tonumber(read())
print("Length?")
local length = tonumber(read())

local z = 0

turtle.turnRight()

while(z < length) do
    dig(width, height)
    turtle.dig()
    turtle.forward()
    turtle.turnRight()
    z = z + 1
end