Round Solar Powered Road Studs For Road Safety In Singapore. Green Solar Powered Road Studs Company In Singapore. Singapore 101 Thompson Road #15-03 United Square Singapore 307591 P 65 6572 9050 F 65 6259 4690 E sales.sg@csisolar.com. Taiwan, China – Taipei 36F-A3, No.68, sec. 5 Zhongxiao E. rd., Xinyi Dist., Taipei City 110 ,Taiwan Tel: 02