“This past September, US District Court Judge Edward Chen granted the suit class-action status, clearing the way for drivers across the state to be included. Uber then tried to limit the size of that class, by saying many of its drivers had signed an “arbitration clause” — a legal agreement designed to force employees to settle grievances outside of the courts — that barred them from filing suit. Uber quietly inserted the clause into its driver agreement back in 2014. But on Wednesday, US District Court Judge Edward Chen rejected the validity of the arbitration clause, expanding the group of drivers eligible to sue Uber to as many as 160,000. He called the clause “both procedurally and substantively unconscionable,” since there was no clear way for drivers to opt out.