The bridge alternative had some proponents during the 1980s. It was proposed consisting of the Drøbak Bridge, a three-pylon cable-stayed bridge with main spans of , respectively, with the central pylon placed on Askholmen. On Håøya the route would largely run through a tunnel. Across Vestfjorden the road would cross on another three-pylon cable-stayed bridge with main spans of , with the central pylon placed on Stedgrunnen. The bridge could also serve as possible route for the Hurum Line, a railway which was proposed to link the new airport to the capital. Fjordbruene worked for a bridge alternative, but also made detailed plans for a tunnel. The tunnel plans were passed unanimously by the municipal councils in Røyken and Frogn in February 1986 and by a large majority in Akershus County Council in April. By 1988 three of the four bridge alternatives had been vetoed by the Norwegian Armed Forces. On 21 June Action Against a Bridge was established in Drøbak and had more than 2,000 members within days.