The suite of advanced transportation controller standards has been completed and balloted by the Institute of Transportation Engineers, the National Electrical Manufacturers Association and the American Association of State Highway and Transportation Officials, as well as the California Department of Transportation. Several manufacturers offer roadside equipment and software compliant to the standards. Hardware, software and communications interoperability has been demonstrated among manufacturers and public sector software applications. Large scale deployments of equipment have been completed. Standards development efforts related to the US Department of Transportation (US DOT) IntelliDrive initiative provides the link to emergency transit and multimodal applications. The ITS architecture is supported by fully functional, open-architecture standards defining equipment and software that is widely deployed in transportation applications, including significant deployments outside of the US. The recent completion of the Society of Automotive Engineers standards and the US DOT IntelliDrive initiative increases the need for powerful roadside software applications and communications that are interoperable worldwide.