highway.lua

c = 1
for i = 0, 500, 1
do
  if turtle.getFuelLevel() < 50 then
    turtle.select(16)
    turtle.refuel(5)
    turtle.select(1)
  end
  if turtle.getItemCount(c)==0 then
    c = c + 1
  end
  turtle.select(c)
  turtle.dig()
  turtle.forward()
  turtle.digUp()
  turtle.placeDown()
end