If you are using Microsoft Internet Explorer 7 or later versions, or Mozilla Firefox for your browser, you should have no problems viewing our site. However, versions of Internet Explorer older than version 7 are known to have issues opening certain pdf documents. (Please note that Internet Explorer 7 requires the Windows XP or later operating system).
If you encounter problems opening a pdf file on our site, you should either upgrade to Internet Explorer 7 (or a later version when they become available) or install Mozilla Firefox. We have found no issues with Firefox opening pdf documents.
Web site documents are commonly posted in .html format. Documents in this format do not have fixed margins and page breaks. This creates margin- related problems when the files are printed. For this reason, the documents visitors to our site are most likely to print have been posted in .pdf (portable document file) format. (The Iowa DOT traffic count maps, available from the DOT site through a link on our site, also require the Adobe Acrobat Reader). Files saved in .pdf format are indicated by (.pdf) throughout our site. To open and print these files you must have the Adobe Acrobat Reader installed on your machine. This is a free download available from Adobe's Website.
If you encounter a problem opening a pdf document, first verify your browser is Internet Explorer version 7 or later, or Mozilla Firefox. (See the links in the first paragraph on this page). If you are using an older version of Adobe Acrobat you may need to uninstall it, and load a newer version. In general, Adobe Acrobat Reader 7.0 or later should have no problems opening the pdf files on our site.
We no longer post map files in .djvu or .sid format. All maps are now stored on our site as .pdf files and require the free Adobe Acrobat Reader plugin, available from www.adobe.com.
If you use Microsoft Internet Explorer, the DJVU plugin works interactively with our map files. You can open, zoom, and print the files with no extra steps.
If you use the Mozilla Firefox browser, the process of viewing the maps is slightly more involved. When you click a DJVU file in Firefox, the browser will prompt you to save the file to your local drive. Once the file is saved, you can then view it as a local file, and should have no problems zooming or printing the file.