The Interstate Grade FG 300 Curb System is a median separation system that provides efficient and cost-effective channelization of traffic on freeways, toll-ways, city streets and rail-highway at-grade crossings. This 1-piece curb system is an FHWA-approved passive traffic control device consisting of modular raised curb sections mountable by emergency vehicles, and FG 300 EFX uprights, the toughest channelizer posts on the market.