California Supreme Court rules Uber must face driver's lawsuit over worker classification

California Supreme Court rejected Uber's argument that drivers gave up right to sue by signing arbitration agreements.
Lawsuit alleges Uber misclassified drivers as independent contractors instead of employees entitled to expense reimbursement.
Ruling allows driver to represent other drivers in class-action lawsuit under California's Private Attorneys General Act.
Uber considering appeal options, citing conflict with previous US Supreme Court ruling on arbitration.
Case disputes driver classification and claims violations of minimum wage, overtime and expense reimbursement rules.