Some people go door-to-door to get your attention, others write messages through social media, and of course many stick to waving signs and banners that you just can't help but notice.
That's exactly what was happening Saturday at the Elk Vale Interstate 90 overpass.
Overpasses for Obama's Impeachment is a nationwide group of 32,000 members who call for the impeachment of the president.
Nationally 350 groups rallied on overpasses across the country Saturday.
South Dakota chapter spokesman Bill Coutts says they rally over the interstates so they send their message to as many people as possible.
"It gives you better visibility and in a high traffic area so that people can see you and it's where a lot of traffic is going through."
Coutts says in the last two-and-a-half weeks the group has added 12,000 members.