Credits and licences
Last updated 2026-10-13
Our own code
The tools and page layouts are written for this site. The pages make no requests to other servers: maps are drawn from data built into the site, and the campground and historic place finders load their data files from this site.
Data and other third-party material
The data below comes from US government sources and is in the public domain; Road Trip Desk is not affiliated with or endorsed by any of these agencies. Published figures change: each tool shows the date of the data it uses.
| Name | Used for | Licence |
|---|---|---|
| National Park Service API (parks, entrance fees and passes) | Names, designations, states, locations and entrance fees of the 474 Park Service sites (harvested 2026-08-22 and 2026-10-09); pass prices from nps.gov/planyourvisit/passes.htm (checked 2026-10-13) | U.S. Government work, public domain (17 U.S.C. 105) |
| U.S. Census Bureau TIGERweb (generalized state boundaries) | State outlines of every US map, projected and simplified at build time | U.S. Government work, public domain |
| Recreation Information Database (RIDB) | The 4,834 federal campgrounds, their campsite counts, hookups and RV lengths (harvested 2026-08-22) | U.S. Government data, public domain |
| National Register of Historic Places (NPS) | The 72,671 listings with location, year listed and type (harvested 2026-10-09) | U.S. Government work, public domain |
| U.S. Energy Information Administration, weekly retail gasoline and diesel prices | Gas and diesel prices by state and region in the cost calculators (the week is shown with every price) | U.S. Government work, public domain |
| NOAA Solar Calculator equations (after J. Meeus, Astronomical Algorithms) | Sunrise, sunset, twilight and golden hour times, implemented in our own code | U.S. Government work, public domain (algorithm description) |
| d3-geo geoAlbersUsa (projection constants) | The Albers USA map layout (parallels, insets and offsets) reimplemented in our own code | ISC |