The Liberal Democrat leader said in his letter to the Equalities and Human Rights Commission that nearly ten million people could see their democratic rights "ripped away".
The plan sets the scene for simultaneous trials by US and Chinese autonomous taxi giants in London, as the capital becomes the European centre of a self-driving revolution.
Some of the biggest names of British 90s music were at the ceremony, including Liam Gallagher, Paul Weller, Bobbie Gillespie and Bez, from the Happy Mondays.