GridLock Traffic Systems, Inc. Search | Advanced Search | New Members | Coupons and Discounts | All Categories Other >> INDOT Prequalified Contractors as of 11/01/2024 >> E(D) Traffic Control: Sign Installation GridLock Traffic Systems, Inc. 6400 Massachusetts AveIndianapolis, IN 46226 | map | directions (317) 541-2727 Visit Site Connect With Us