Which really causes more real-world traffic problems: cold weather or warm weather?

CTV British Columbia- Highway cleared after huge chain-reaction crash

Freezing rain and slippery conditions overnight are likely to blame for a massive chain-reaction crash on B.C.'s Coquihalla Highway just south of Merritt.

The highway was shut down at around 10 p.m. Thursday night when a transport truck lost control between Merritt, B.C. and the old toll booth.

When all the slipping and sliding was over, eight semi-trailers, a Greyhound bus and five other cars or pick-up trucks were badly damaged.

Miraculously, only five people were slightly hurt -- and four of them were among the driver and 23 passengers aboard the Greyhound.

The highway was closed for about seven hours while the wreckage was cleared away, but traffic is moving again as RCMP continue to investigate the cause of the accident.

3 die on slippery roads in Twin Cities

Accidents on icy Twin Cities area roads early today and Friday have killed two people and injured three others, the State Patrol is reporting.

Mar '08: Climate change could snarl U.S. transport: study | Environment | Reuters

WASHINGTON (Reuters) - Flooded highways, railroads and airport runways are among the transportation snarls looming as the world's climate changes, and officials should plan with this in mind, a U.S. study says.

Modern transportation that runs on fossil fuel has been singled out as a key cause of climate change but the study released on Tuesday by the National Research Council said most transport also is vulnerable to the effects of global warming.