When we travel by car, we check the website before our trip to find potential caches by going to the Main Page, then "Search for a cache" (or whatever the pull-down menu says that is similar to that), then choose a state that we will be driving through. Once you have chosen a state, there should be a MAP option at the top of the page. Click on that, and it will show little cache icons. Zoom in to the area that the highway goes through, then click on "Identify." Below the map, the names of caches will appear as links, and you can view them individually and choose the ones that look like they would be good "grab and go" caches for travellers. Hope this helps!