Specifications include, but are not limited to: Functional and Performance Requirements. RSU must minimally support SAE J2735 compliant message sets, including: Basic Safety Message (BSM), Signal Phase and Timing (SPaT), Map or Geometric Intersection Description (GID) and Traveler Information Message (TIM). RSU must support the full range of Provider Service Identifiers (PSIDs) as specified in IEEE 1609.12. RSU’s must contain a Hardware Security Module (HSM) for generating and storing private security keys for use with Security Credential Management System (SCMS) "Production" Certificates. D. RSUs must be able to enroll with an SCMS with a "production" Root E. RSUs must be able to request and download Security Certificates based on a production Root.