I think non-cyclists underestimate how much headwinds slow you down. Wind resistance is proportional to the square of (your velocity + headwind). It's a major f

I think non-cyclists underestimate how much headwinds slow you down. Wind resistance is proportional to the square of (your velocity + headwind). It's a major factor in cycling speed, which is why velomobiles can be so much faster than normal bicycles. A strong headwind feels like riding up a hill, and flat terrain typically has stronger winds.