AMP: 0 Location: SR 629 and Voluntown Rd, Jewett City, Griswold No signage as SR 629 begins. 629 is a frontage road for I-395 south. AMP: 0 Location: SR 629 and Preston Rd, Jewett City, Griswold .26 miles later, SR 629 ends as we approach CT 164. Turn right for 164 north and left for … Continue reading Connecticut State Road 629, I-395/CT 138 to I-395/CT 164