Opseth announced in January 1994 that he favored a tunnel over a bridge, stating that decisive weight had been laid on costs. The tunnel was estimated to cost NOK 1.25 billion, while a bridge would cost NOK 170 million more. Opseth's also announced that he favored a motorway alternative with twin tubes and four lanes. The project was partially met with opposition in Parliament, as for instance Magnus Stangeland of the Center Party stated that other projects should be prioritized. New estimates showed reduced traffic and the issue ended in a compromise: one tube would be built and a new road would only be built as far west at Bjørnstad in Røyken. Financing was secured through a combination of state grants and tolls. The tolls were financed through private debt accumulated by Bompengeselskapet Oslofjordtunnelen, owned jointly by Akershus County Municipality and Buskerud County Municipality and established in late 1995. The single tube reduced the total construction cost to NOK 1,041 million. To cut costs further, plans to build northwards and westwards from Hurum were placed on hold. Thus the new auxiliary road network was limited to , including the tunnel itself. The toll portion of the investments were set at NOK 699 million.