Two people were taken to hospital after a five-vehicle collision on the Coquihalla Highway on Sunday afternoon.
The crash happened at the Great Bear Snow Shed just after 4 p.m., Cpl. Mike Halskov said.
RCMP said snow melting in the northbound lane was leeching over into the southbound lane and then freezing, creating slippery conditions.
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The variable speed corridor in that portion of the road had reduced its speed limit to 60 km/h, Halskov said.
A vehicle tried to pass a slow-moving semi-truck but lost control and caused a chain-reaction crash, he added.
Although two people suffered from non-life-threatening injuries, the use of seatbelts likely prevented further injuries, Halskov said.