This line shapefile represents airport runways in California. These are runways for which the Department of Transportation (Caltrans) HQ Aeronautics maintains information. These data were created in May 2006 and updated in April 2011. This layer is part of a collection of GIS data created by the California Department of Transportation (Caltrans). 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. California Department of Transportation. (2011). Airport Runways, California, 2011. California Department of Transportation. Available at http://purl.stanford.edu/cj067sr0133. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.