In June 2008 cost was estimated at 2,5 billion euro. Return on investment in the Oosterweel connection was expected to come from toll revenue generated at the Oosterweel tunnel. In order to guarantee these revenues, the banks requested that the existing Kennedy tunnel be closed to lorry traffic as soon as the Oosterweel connection would be operational. It was also stipulated that during a period of 35 years, it would be forbidden to make any decisions that might diminish traffic levels in the Oosterweel tunnel.