Tag Reader (IMAGE) Rensselaer Polytechnic Institute Caption A portable, solar-powered tag reader that collects data to monitor traffic flow. Credit Rensselaer/ Jeffrey Wojtowicz Usage Restrictions Include credit line License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.