After almost a decade of R&D, vehicular communications for cooperative systems and its enabling technologies, mostly relying on IEEE 802.11p and IEEE 1609.1-4 family of standards, are in their trial phase, as some major field operational tests are being carried out. Nev- ertheless, there are still some open problems concerning the timeliness, dependability and security of IEEE 802.11p based communications. This paper presents an architecture to implement fail-silent road side units (RSU) required to deploy infrastructure to vehicle (I2V) safety communi- cations. Although generic, the proposed architecture is described within the scope of the Vehicular Flexible Time-Triggered protocol (V-FTT) and takes advantage of a flexible, FPGA-based softcore implementation of an IEEE 802.11-A6 / ETSI ITS G5 controller.