Yeah, I suppose in Germany, you only have an option for Type L, due to the cold temps you can get. Maybe here in the states going up north Type M might not even be available.
However, I'm pretty sure if you use refrigerator water tubing, that's Type M, as it's very easy to bend. But then again, that's definitely inside the house and kept well above freezing (one would hope).
Side Note: I think the US should take notes from Germany and install solar panels along their highways/interstates. A good use for the blank space of real estate.