Chain Control Signs

Description

The Chain Control point (CC) files provided below describe the location and status of each Caltrans' chain control point located on the State Highway Network.

File formats include CSV, JSON, TXT and XML. Each file format contains the same data set. These files are available for integration into your application and are available via the HTTPS protocol. There is no charge for the use of this data.

Conditions of Use

Please read the Conditions Of Use before using these data sets.

Announcements

• October 20, 2020 : On November 9, 2020 Caltrans will be migrating the Caltrans Wholesale Website Portal Version 2 (CWWP2) to the HTTPS protocol from the HTTP protocol. HTTP will be available until November 9th, 2020 and will be redirected to HTTPS thereafter. HTTPS will not be available until after the transition on November 9th, 2020. Please update your clients and applications that utilize the CWWP2 as necessary to accommodate this important change.

Data Format and File Layout

Data is available in four file formats that contain the same information to allow easy integration into your application. Included below are the file format layouts:

• CSV - Comma Separated Values
• JSON - JavaScript Object Notation
• TXT - Text file with delimeter value of "ÿ" or 0xFF
• XML - Extensible Markup Language

Data Description

Data in each of these file formats are defined in the following documents:

• Field description - Describes field number, field name, description, type, nominal value, example value and which file format field is used
• Chain Control Status Chart - Decodes the value reported in the Status field
• GIS Data Dictionary (XLSX) - GIS Portal Data Dictionary for the CWWP2 Chain Control data sets
• District Reporting Matrix - Describes which Districts are reporting data in each field
• District Map and County Chart - Shows the relationship of Districts to counties
• Route Chart - Lists the state highway routes
• Postmile Prefix / Route Suffix / Alignment Charts - Decodes the values reported in the Postmile Prefix, Route Suffix and Alignment fields

Deprecated Files

The files listed in the link below are deprecated and should not be used for new software development. Support and documentation for these feeds is limited.

• Chain Control Deprecated Files

File Locations

Data sets are broken up by Caltrans Districts.

• CSV Format

  Chain Control CSV files available by district, file update frequency, file url and comments

  District	File Update Frequency	File URL	Comments
  1	once a minute	https://cwwp2.dot.ca.gov/data/d1/cc/ccStatusD01.csv
  2	once a minute	https://cwwp2.dot.ca.gov/data/d2/cc/ccStatusD02.csv
  3	once a minute	https://cwwp2.dot.ca.gov/data/d3/cc/ccStatusD03.csv
  6	once a minute	https://cwwp2.dot.ca.gov/data/d6/cc/ccStatusD06.csv
  7	once a minute	https://cwwp2.dot.ca.gov/data/d7/cc/ccStatusD07.csv
  8	once a minute	https://cwwp2.dot.ca.gov/data/d8/cc/ccStatusD08.csv
  9	once a minute	https://cwwp2.dot.ca.gov/data/d9/cc/ccStatusD09.csv
  10	once a minute	https://cwwp2.dot.ca.gov/data/d10/cc/ccStatusD10.csv
  11	once a minute	https://cwwp2.dot.ca.gov/data/d11/cc/ccStatusD11.csv

• JSON Format

  Chain Control JSON files available by district, file update frequency, file url and comments

  District	File Update Frequency	File URL	Comments
  1	once a minute	https://cwwp2.dot.ca.gov/data/d1/cc/ccStatusD01.json
  2	once a minute	https://cwwp2.dot.ca.gov/data/d2/cc/ccStatusD02.json
  3	once a minute	https://cwwp2.dot.ca.gov/data/d3/cc/ccStatusD03.json
  6	once a minute	https://cwwp2.dot.ca.gov/data/d6/cc/ccStatusD06.json
  7	once a minute	https://cwwp2.dot.ca.gov/data/d7/cc/ccStatusD07.json
  8	once a minute	https://cwwp2.dot.ca.gov/data/d8/cc/ccStatusD08.json
  9	once a minute	https://cwwp2.dot.ca.gov/data/d9/cc/ccStatusD09.json
  10	once a minute	https://cwwp2.dot.ca.gov/data/d10/cc/ccStatusD10.json
  11	once a minute	https://cwwp2.dot.ca.gov/data/d11/cc/ccStatusD11.json

• TXT Format

  Chain Control TXT files available by district, file update frequency, file url and comments

  District	File Update Frequency	File URL	Comments
  1	once a minute	https://cwwp2.dot.ca.gov/data/d1/cc/ccStatusD01.txt
  2	once a minute	https://cwwp2.dot.ca.gov/data/d2/cc/ccStatusD02.txt
  3	once a minute	https://cwwp2.dot.ca.gov/data/d3/cc/ccStatusD03.txt
  6	once a minute	https://cwwp2.dot.ca.gov/data/d6/cc/ccStatusD06.txt
  7	once a minute	https://cwwp2.dot.ca.gov/data/d7/cc/ccStatusD07.txt
  8	once a minute	https://cwwp2.dot.ca.gov/data/d8/cc/ccStatusD08.txt
  9	once a minute	https://cwwp2.dot.ca.gov/data/d9/cc/ccStatusD09.txt
  10	once a minute	https://cwwp2.dot.ca.gov/data/d10/cc/ccStatusD10.txt
  11	once a minute	https://cwwp2.dot.ca.gov/data/d11/cc/ccStatusD11.txt

• XML Format

  Chain Control XML files available by district, file update frequency, file url and comments

  District	File Update Frequency	File URL	Comments
  1	once a minute	https://cwwp2.dot.ca.gov/data/d1/cc/ccStatusD01.xml
  2	once a minute	https://cwwp2.dot.ca.gov/data/d2/cc/ccStatusD02.xml
  3	once a minute	https://cwwp2.dot.ca.gov/data/d3/cc/ccStatusD03.xml
  6	once a minute	https://cwwp2.dot.ca.gov/data/d6/cc/ccStatusD06.xml
  7	once a minute	https://cwwp2.dot.ca.gov/data/d7/cc/ccStatusD07.xml
  8	once a minute	https://cwwp2.dot.ca.gov/data/d8/cc/ccStatusD08.xml
  9	once a minute	https://cwwp2.dot.ca.gov/data/d9/cc/ccStatusD09.xml
  10	once a minute	https://cwwp2.dot.ca.gov/data/d10/cc/ccStatusD10.xml
  11	once a minute	https://cwwp2.dot.ca.gov/data/d11/cc/ccStatusD11.xml