The Simple Platoon Advancement (SPA) model describes a conceptual system where a combination of roadway infrastructure and in-vehicle systems controls the longitudinal progression of vehicles through signalised intersections. The primary objectives of the SPA system are two-fold. The first is to increase - compared to traffic behaviour of today - the throughput of vehicles through signalised junctions and thereby reduce vehicular delays. The second is to improve safety at intersections by automating the decision task required of drivers on their approach. This paper reports on recent developments of theoretical models and outlines the next stages in the investigation of the reductions in delays that are likely if vehicles and roadways are kitted with SPA system technologies. (a) For the covering entry of this conference, please see ITRD abstract no. E210413.
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