The second tube is planned located parallel with the current tube, shifted to the side, to be built south of the current tube. This will allow each of the tubes to act as an emergency exit for the other. This design was built into the original plans, in which the road administration anticipated building the crossing as a full motorway in two phases. The two tubes will be connected by emergency exits every . The second tube will have to closely follow the route of the current tunnel, thus eliminating the possibility of a less steep gradient. The Public Roads Administration regards the section through sediments at Hurum as the most challenging part and is considering altering the tunnels positions, both horizontally and vertically, through this part.