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Officials from the DTM and Japan's Super GT series have set a new provisional deadline for the creation and presentation of the unifying 'Class One' regulations.

The jointly-developed regulations had initially been penciled in for introduction ahead of the two series' 2017 seasons, but a fifth meeting of the collaborative steering committee between the two parties on Wednesday has now given the groups until September '17 for the creation of the rules package.

Representatives from the Japanese Super GT series, DTM promoter ITR and all teams from the two series - Honda, Nissan and Toyota in Japan and Audi, BMW and Mercedes in Germany - were present at the fifth meeting of the committee, where continue co-operation between the two series was agreed.

Last November it was confirmed that the two series were still working to hold races together in the 2017 and '18 seasons, though any such events next season now look unlikely given the pushing back of the implementation of the regulations.

"During today's meeting we made another step forward regarding the harmonisation of the regulations and defined the next milestones on the way to doing so," said ITR chairman Hans Werner Aufrecht.

"Furthermore, we succeeded in describing the way along the two main goals: cost reduction and geographic expansion of the marketing campaigns."