Polymer manhole lids from Trumbull Industries are ideal for highway use in place of cast iron lids. Versions are available through 30-inch diameters for water meters and sanitary sewers. They have no scrap value, eliminating the theft problem common to cast iron lids. They are also lightweight, reducing finger and back injuries. They are radio-friendly, allowing signals from AMR and AMI water meter systems, as well as flow monitoring devices, to pass through. 800/677-1799; www.trumbull-mfg.com.