The Expressway signboards warn of traffic trouble between 1 and 3 p.m., but ...

The signboards along the Expressway say drivers should expect delays between 1 and 3 p.m. today as the president arrives in town for his "cancer moonshot" speech at the JFK Library.

Only thing is the speech is at 4 p.m. And then the officials White House schedule says he'll be staying in town for a Democratic National Committee reception at 6 p.m. We'll go out on a limb and assume that's not at the neighboring Bayside DoubleTree, so that probably means a motorcade somewhere downtown or in the Back Bay. And then he departs Boston at 7:10 p.m., which means still more traffic issues as he gets taken to Logan.