The speed limit was reduced from on 7 September 2011. This resulted in a doubling in the number of issued speeding tickets, with 1,200 tickets issued in the first month. From March 2012 the weight restriction was lifted, but instead replaced by a length limitation of , in an attempt to allow smaller commercial vehicles to use the tunnel. To cover necessary upgraded to improve the tunnel's safety, Parliament awarded a grant of NOK 40 million in May. The most extensive investment was the construction of 26 evacuation rooms. With these installations in place the Public Roads Administration hoped to re-open the tunnel for heavy traffic, but the decision was vetoed by Southern Follo Fire Department.