...amongst traffic? yep, for sure. As many senses as possible. No earplugs. And definitely no Harley!
Droning along a freeway with the windnoise just kills my ears. Ride for a couple of hours and my ears feel shot. Mind you Arais tend to be quite noisy.
On the little racebike, earplugs! Apart from the fact that your head just fitted under the screen, the little engine is obnoxiously loud....it was worse before I got an airbox for the 40mm carb...