Report Sees Dire Future for Warming's Impact on U.S. Transport

Heat waves and very hot days could cause thermal expansion on bridge joints, the buckling of pavement and the deformation of railroad tracks. Increased temperatures could also upset aircraft lift-off load limits, particularly at high-altitude airports with insufficient runway lengths, resulting in flight cancellations or limits in payload.

- More intense snow and rain events could overload drainage systems, wash out roads, damage rail-bed support structures and cause mudslides. They could also increase delays at airports and affect the depth of shipping channels, as the patterns of silt deposit change.
...
Of course, not all effects are negative: For example, fewer cold days mean less time and money will have to be spent on road salt and on de-icing planes (but they could also mean more freeze-thaw conditions, creating frost heaves and potholes).

Feb '09: Snow Britain: road accidents treble because of snow - Telegraph

The number of road accidents trebled on Monday after motorists ignored advice to leave their cars at home, it has been claimed.