  Cooperative ITS is enabling vehicles to communicate with the infrastructure
to provide improvements in traffic control. A promising approach consists in
anticipating the road profile and the upcoming dynamic events like traffic
lights. This topic has been addressed in the French public project Co-Drive
through functions developed by Valeo named Green Light Optimal Speed Advisor
(GLOSA). The system advises the optimal speed to pass the next traffic light
without stopping. This paper presents results of its performance in different
scenarios through simulations and real driving measurements. A scaling is done
in an urban area, with different penetration rates in vehicle and
infrastructure equipment for vehicular communication. Our simulation results
indicate that GLOSA can reduce CO2 emissions, waiting time and travel time,
both in experimental conditions and in real traffic conditions.
