First steps towards vehicle-to-infrastructure implementation in South Africa : a Stellenbosch case study

Abstract

This research presents the implementation and evaluation of South Africa's first Vehicle-to- Infrastructure (V2I) communication system. As a proof-of-concept, the study aimed to demonstrate the feasibility of adapting a well-established Right-Hand traffic (RHT) V2I system to local Left-Hand Traffic (LHT) conditions to address congestion, intersection safety, and environmental concerns. The implementation involved developing detailed Intersection Topologies and Virtual Controllers to support real-time traffic signal communication through MAP and SPaT messages. The implemented system integrated two V2I functionalities: Red-Light Countdowns and Green Light Optimal Speed Advisories (GLOSA). Summative evaluations were conducted through test drives, to confirm the system’s accuracy and reliability, while outcome evaluations using microscopic traffic simulations assessed its broader impact on traffic and emissions. Results indicated that V2I communication improves vehicle delays, reduces vehicle stops, and enhances traffic flow, particularly under lower congestion levels. The findings demonstrate the feasibility of V2I adoption in South Africa, highlighting its potential to improve urban mobility and support sustainable transport solutions.