Approximately 75 new toll stations shall be built in Oslo and Akershus. This is due to two new toll rings being established, one along Ring 2 and one on the city boundary toward Akershus. At the same time, the existing toll ring shall be expanded in order to collect fees in both directions. The aim is that all three toll rings shall be completed and in operation by March 2019.
A more detailed description of the project can be found here:
https://www.vegvesen.no/vegprosjekter/oslopakke3