Blochmont Pass

Depending on which direction you are coming from, you will experience a gentle 3% grade downhill or uphill. It's a fairly pleasant climb to do because the slope is relatively easy. In the other direction, it is a beautiful descent that can be traversed quickly.

So you really do not realize that this is a pass - the slope is always moderate (about 3% coming from the north), beautifully shady in the forest it's even high and suddenly you're over it.

actually more of a gentle hill than a real pass, but as the only transition far and wide from north to south over the foothills of the blue, it is a frequently traveled route. The next options for road bikes are relatively far to the west via Lucelle and to the east with the Challpass, which is a "real" but also very busy pass.
With the two possible routes directly from the north of Raedersdorf or via Wolschwiller from north-east to Kiffis, you can also drive an attractive north-north variant without going down into the Lützeltal.