Y-intersections, S-curves, and hidden signals. These designs distort perception and focus, raising accident risk, especially ...

That makes bridges and overpasses especially dangerous. A road may be clear and free of snow, ice or black ice, lulling drivers into thinking they have nothing to fear.

More: Black ice, a winter danger 'It happened so fast': Black ice turns roads into invisible skating rinks. That's why many highways sport "Bridge ices before road" and similar signs to caution ...