Simple answer: >30 degrees.
Long answer Journal of Transport & Health ∎ (∎∎∎∎) ∎∎∎-∎∎∎ (sic!).
CC-BY-NC Science Surf , accessed 17.08.2026
Simple answer: >30 degrees.
Long answer Journal of Transport & Health ∎ (∎∎∎∎) ∎∎∎-∎∎∎ (sic!).