Is this you? As a journalist, you can create a free Muck Rack account to customize your profile, list your contact preferences, and upload a portfolio of your best work.
Claim your profile
You were right. You are not allowed to turn on a red arrow. The Pennsylvania Driver's Manual says you can turn right on red after stopping, but only at a steady red light, unless a sign is present prohibiting such a turn. (This is actually true in almost all of the United States, with the notable exception of Manhattan, a borough of New York City.) However, at some intersections, such as the one you mentioned, you may see a red arrow.
As a journalist, you can create a free Muck Rack account to customize your profile, list your contact preferences, and upload a portfolio of your best work.