There has been significant progress towards rolling out security and privacy solutions for vehicular communication (VC) systems. What remains a challenge is how such solutions will scale as the penetration (the fraction of vehicles that are secure and privacy-enhancing VC-ready) increases. How is the verification of hundreds (or even thousands) of messages per second to be handled? How is credential management to be structured at a global scale and what resources would be needed for that security and privacy infrastructure locally (e.g., to service vehicles for a sizeable city)? Concerned with these questions, we discuss recent research results on (i) efficient message verification and (ii) the design and performance of the credential management infrastructure.