The existing retaining wall is 310 mm thick. For the proposed VRS post base, a minimum thickness of 450 mm is required.
Proposed solution: Break off the top 600 mm retaining wall section to expose reinforcement, add in extra reinforcements for an enlarged plinth section:
A concrete base with quite odd shape was designed for a VRS post：
EQU check of the system under impaction forces in the case of a car collision was carried out: