The following Functional Areas are associated with the "Southern California Electronic Toll Collection Plazas" element.   Each functional area includes a brief description and a bulleted list of detailed functions.   The common icon provides a link to other systems in the region that include the same functional area.

Toll Plaza Toll Collection

Roadside collection of tolls from vehicle toll tags and violation identification.

• The field element shall read data from vehicle toll tags to support toll payment transactions.
• The field element shall update the toll tag value after debiting the toll amount and send a record of the transaction to a center.
• The field element shall read the credit identity on the toll tag and send that identity and the amount to be debited to a center.
• In the case of closed toll systems, the field element shall update the toll tag with the system entry point, and upon toll system exit, used in the calculation of the toll.