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55 mation systems that states have developed and implemented der is enrolled (registered) and installed on a specific vehi- across the United States. To integrate the existing state systems, cle, a direct link between the transponder ID and the vehicle FMCSA has applied open architecture and standards as well as identification number (VIN) is established. a common technical framework for development and deploy- · License-plate readers and U.S. DOT number readers: For ment of CVISN. The characteristics of the open architecture those trucks without a transponder, license-plate readers and the common technical framework are as follows: and number readers will be implemented. For the basic CVISN, it is an optional technical component but is · Open architecture and standards: CVISN uses this approach required in the expanded CVISN. The quality of reading so that the systems developed by individual states can be is 40% to 65%, depending on lighting, reflectivity, con- linked together and communicate to each other. trast, and other factors. · Common technical framework: CVISN provides a com- · Weigh-in-motion (WIM) scales. mon technological framework and a basis for developing · Roadside readers: To obtain VIN from the transponder. interface standards. Examples of key features of the CVISN · Roadside operations computer (ROC) in the weigh station. architecture include States' choices: The CVISN architecture does not specify Figure 31 shows electronic screening equipment needed for a particular design for states or carriers, which are free to roadside inspection. Figure 32 demonstrates an operational make their own design(s) to meet their needs. scheme for CVISN that shows how roadside screening equip- Interoperability and compatibility: Systems and compo- ment and fixed and mobile verification sites work together to nents deployed by different organizations (or by the ensure the safety of freight transportation. same organization) work together to accomplish shared functions. 3.3.4 The Current Status of the CVISN As of February 2010, the deployment status of CVISN was 3.3.3 Technology Components as follows: of the System To conduct roadside electronic screening (or e-screening) of · Expanded CVISN: 23 states have completed the deployment trucks, CVISN requires the following specific technological of the core CVISN and are deploying the expanded CVISN; components: · Core CVISN: 23 states plus Washington, D.C., have deployed only the core CVISN; and · DSRC transponder: A transponder is mounted on the wind- · Planning and design for the core CVISN: four states are at shield and has red/green indicators. Because each transpon- this stage. Source: U.S. DOT, FMCSA, 2008 Figure 31. Example of electronic screening equipment.