sentences:  The tunnels would be constructed with provision for three lanes in each direction.A raised surface motorway through Alan Wood Park and the short section between the bored and cut and cover tunnel portals near the Great North Rd and Blockhouse Bay Rd intersection were the largest differences between this new preferred route and the previous bored tunnel option.At $1,165 million, it was cheaper than the $1,974 million two-lane bored tunnel option and the $2,335 million three-lane bored tunnel option.