Dara Khosrowshahi is resigning from the board of autonomous vehicle technology company Aurora Innovation, citing a desire to focus on his ongoing responsibilities as CEO of Uber and reduce external board commitments, according to a Friday regulatory filing.

Khosrowshahi’s resignation was effective as of Tuesday. Aurora says Khosrowshahi’s decision to leave the board was not the result of any disagreement with the company. 

The Uber chief executive and Aurora Innovation go way back. In 2020, Uber offloaded its own self-driving unit, Uber ATG, to Aurora. The deal at the time involved Uber handing over its equity in ATG and investing $400 million into Aurora, giving it a 26% stake in the combined company. Khosrowshahi joined Aurora’s board as part of the deal.

Through Uber Freight, Uber’s freight brokerage platform that connects shippers and carriers, the ride-hail and delivery giant maintained its connection with Aurora. In June, Uber and Aurora announced a multi-year collaboration to put trucks powered by Aurora’s technology on the Uber Freight network. 

Uber’s relationship with Aurora, however, is not exclusive. The company also has a deal with Waabi, the self-driving truck startup founded by Raquel Urtasun, who had previously served as chief scientist and head of R&D at Uber ATG.