GridLock Traffic Systems, Inc. Search | Advanced Search | New Members | Coupons and Discounts | All Categories Related Categories A - ZSubcontractorsConstruction Materials Vendors/SubsTraffic Control DevicesConstruction Service Vendors/SubsTraffic ControlContractorsPavement MarkingINDOT Prequalified Contractors as of 05/01/2025E(D) Traffic Control: Sign InstallationE(G) Traffic Control: Pavement Markings Other >> INDOT Prequalified Contractors as of 05/01/2025 >> 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