Marylanders for Trump! Smart choice to go to Berlin for a rally. How did all the people along the route know about it?
This was a rural area.
Pretty much only one main route from the Salisbury airport to Berlin, so folks knew which intersections to congregate at.
There are only so many routes you can take in MD on the Eastern Shore to get to certain places. And depending on where his plane landed, the route is all but known.