Some roads exist to connect. Others seem designed to terrify. Across every continent, certain routes have earned a fearsome reputation — carved through mountain cliffs, battered by ocean storms, ...

In Northern Ireland, on narrow roads flanked by unyielding stone, the motorcycles fly. The bikes are out of their element, ripsaw racing machines of furious speed, bucking under power and rising into ...

The study also ranked the best and worst driving states across the U.S.