aaaww, I'm missing my horses
I haven't had a horse for 15 years, but still I get a pang for them sometimes.
I pass horses sometimes on my bike. Based on my own knowledge of horse psychology, I try to be visible, slow down to a speed horse can understand, and make a steady noise which will signal that I am approaching, if that makes sense. Steady gentle braking, for example, rather than a sudden squeal, or gradually clicking through my gears, or I start speaking gently. "Hiya, horse, I'm coming up beside you, everything's fine, who's a lovely horsie then"
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Horses out on the road should be able to handle a bike approaching, but they do spook at things that startle them. And when they do they can plunge off with the rider, (which isn't necessarily that dangerous) or worse, kick you. If the horse starts to act up it might be best just to get past it quickly if you think you can.
I think they react more to sound and movement (and smell) than to the sight of you, so I don't think removing helmet or glasses will make much of a difference. PS. And I'd only use a bell at a good distance.
btw, Buck is a beaut!
Winter riding is much less about badassery and much more about bundle-uppery. - malkin
1995 Kona Cinder Cone commuterFrankenbike/Selle Italia SLR Lady Gel Flow
2008 white Nakamura Summit Custom mtb/Terry Falcon X
2000 Schwinn Fastback Comp road bike/Specialized Jett