Traffic Volume, California, 2013

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Abstract/Contents

Abstract
This point shapefile contains traffic volume (also known as traffic counts) on California's state highway network created from 2013 Average Annual Daily Traffic (AADT) counts (excel spreadsheet) maintained by Caltrans, Division of Traffic Operations. Annual average daily traffic is the total volume for the year divided by 365 days. The traffic count year is from October 1st through September 30th. Very few locations in California are actually counted continuously. Traffic counting is generally performed by electronic counting instruments moved from location throughout the State in a program of continuous traffic count sampling. The resulting counts are adjusted to an estimate of annual average daily traffic by compensating for seasonal influence, weekly variation and other variables which may be present. Annual ADT is necessary for presenting a statewide picture of traffic flow, evaluating traffic trends, computing accident rates, planning and designing highways and other purposes. This layer is part of a collection of GIS data created by the California Department of Transportation (Caltrans).
Purpose
This dataset is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data.

Description

Type of resource cartographic, software, multimedia
Form Shapefile
Extent 0.522
Place Sacramento, US
Publisher California. Department of Transportation
Publication date 2014
Language English
Digital origin born digital
Map data Scale not given. ; EPSG::4269 W -124.264859--W -114.298927/N 42.005468--N 32.54435, Scale not given ; EPSG::4326

Creators/Contributors

Creator Pribyl, Cindy
Creator California. Department of Transportation

Subjects

Subject Traffic flow
Subject Traffic density
Subject Highways
Subject California
Subject 2013
Subject Transportation
Genre Geospatial data
Genre Cartographic dataset

Bibliographic information

Supplemental information The data list 2013 taffic volumes for all count locations on the California state highway system. Peak hours, peak month ADTs and annual ADTs are shown at each count location. Significant volume changes (breakpoints) in the traffic profile along each route are counted and identified by name and milepost value. In addition to the profile breakpoints, these files list county lines and well-known landmarks to aid in orientation. All traffic volume figures listed include traffic in both directions unless otherwise indicated. Reference link: http://www.dot.ca.gov/hq/traffops/saferesr/trafdata/index.htm
WGS84 Cartographics This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.
Location https://purl.stanford.edu/hw699zq7178

Access conditions

Use and reproduction

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. http://www.gnu.org/licenses.

Copyright
Copyright resides with the originator.

Preferred citation

California Department of Transportation. (2014). Traffic Volume, California, 2013. California Department of Transportation. Available at http://purl.stanford.edu/hw699zq7178.

Collection

California Department of Transportation GIS Maps & Data

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