Due to the Second World War, the construction was begun only in places, the clearest evidence of the construction activity at that time is the Allach-Untermenzinger route clearly visible on aerial photographs, together with remains of the route for the cross with the BAB 8; a never-used bridge at the site was demolished in the mid-1990s.

The junction München-Fröttmaning-Nord was subsequently built to accommodate the additional traffic of the Allianz Arena from and to Stuttgart.

In October 2004, a deletion of the project from the Federal Transport Infrastructure Plan was decided.

Their estimated costs of around half a million euros were shared by the Federation and the Free State of Bavaria.

Since large parts of it would have to be built underground, the construction costs would add up to 45 million euros per kilometer.

The final step of the feasibility study was to examine what impact the proposed routes would have on the environment, space structure, transport and construction costs.

The presentation of the report comes to the conclusion that "taking into account the measures for the prevention and reduction of interventions, the closing of the gap in the motorway ring is basically meaningful and feasible".

On 15 June 2010 the Bavarian Prime Minister, Horst Seehofer, stopped the project.

For the first section between AK München-Nord and AS Aschheim / Ismaning, the plan approval decision was issued on 14 January 2013.

Between the junctions Hohenbrunn and Haar there is a truck control centre of the police and the Federal Office for Freight Traffic in the direction of Nuremberg / Stuttgart.

Conspicuous trucks are then waved out at the checkpoint; There is a calibrated scale with which the exact weight can be determined.

The corresponding slip roads were missing at the interchange München-West until summer 2012, so that one had to use the Eschenrieder Spange.

Likewise, it was not possible to reach the Munich-Langwied junction (between the Munich-West intersection and the Eschenried interchange) on the A 8 from the northern part of the A 99.