Sam Dunklau

Sam is a Public Affairs Reporting intern for spring 2018, working out the NPR Illinois Statehouse bureau.

AP

The question over whether to replace U.S. Supreme Court Justice Ruth Bader Ginsburg before the upcoming election looms large for both of Pennsylvania’s U.S. Senators.

Ted S. Warren / AP

The Wolf administration is renewing its call for the Republican-controlled state legislature to legalize recreational marijuana.

At a news conference Thursday, Gov. Tom Wolf and Lt. Gov. John Fetterman both pitched the idea as a way of shoring up revenue, creating jobs, and enacting criminal justice reform.

Drive down any U.S. interstate and there's a good chance you will see a pun or a funny reference on the next electronic message board you spot. Such messages have become ubiquitous across the country lately.

But besides getting a snicker, what's behind these roadside bits, and are they making drivers behave differently?