A RFID based e-STOP sign and its impacts to vehicle emissions

Traditional STOP signs at unsignalized intersections are easily blocked by trees, trucks and other obstacles, which will induce high risk of incidents and even extra vehicle emissions. The so-called Infrastructure-to-Vehicle (I2V) communications can automatically inform drivers of earlier awareness through in-vehicle display and audio device, which alternates vehicle driving behaviors and operation modes, and will possibly reduce vehicle emissions. In this paper, the feasible working range of the RFID based e-STOP sign within the smart guide signing system (SGSS) at unsignalized intersections is firstly tested, and its impacts on vehicle emissions are further identified. Test and emission estimation results indicate that the RFID based e-STOP sign can reduce vehicle emissions at unsignalized intersections, especially when vehicles make turnings.