This is a cloverleaf interchange, and will need to be revamped if 151 is made into an expressway from here to Wisconsin 26.
An interchange is being constructed in the summer of 1999 at the former intersection of US 41 and CTH N. CTH N will run underneath two new bridges on US 41. To construct this, WisDOT built a small bypass of the site on US 41 so that 4 lanes of traffic will be open at all times while the bridges are being built. I believe this interchange will be start of a conversion to freeway of US 41 between WI 26 and Fond du Lac. All that will need to be done to convert it after the new interchange is built will be to simply end roads that previously intersected with US 41.