There are several ways to navigate around the FMVSS database. You can browse topics, recent updates, or corrections in the toolbar at the top of the page. Or, a little further down, you can use the search bar to enter terms, vehicle parts, or reference numbers for the most accurate results.
When you start typing in the search box, it will populate suggested clickable results.
I clicked on " 49 CFR 571.111 - Standard No. 111; Rear Visibility." It opens the standard, allowing you to read in the browser. It also gives you the option to download/print the PDF on the left side of the page. The top and upper middle of the page tell you exactly which standard you are viewing.
In the left side-toolbar above, you can select: