I agree that most likely the ride in won't be highly trafficked. But this varies from location to location.... The ride back will be more congested.

Wear yellow/orange jerseys. I have one good headlight on the front and a red blinky that clips on the the back of my jersey.

But I saw a guy today that must have had 8 lights on the front and more than that on the back. I was impressed. Couldn't help but notice that guy.

Orange triangle on the back is good. At least one rearview mirror for the left side(as you are sitting on the bike)of the handlebar. But sometimes I could justify have one on each side.

You didn't mention whether you have racks or panniers, but since I also tour and commute, I have the Surly Nice Racks front and Rear, and Ortlieb Roller classics. I wish the Roller Classics had outside pockets, but they each have an inside pocket.

There is some really bright reflective material on the back of each bag. And the Nice Racks give the bike more 'girth', which seems to make it appear to own the lane better to drivers.

I don't really know it that's what it is but I get a lot more 'respect' from drivers on my LHT than I did riding my racing bike.