I-86 East is still closed from Exit 16 to Exit 19.
Route 66 is expected to be closed for a couple more hours following a 10-vehicle crash involving five tractor-trailers and five passenger vehicles.
Freezing rain throughout the region has turned area roads into ice skating rinks.
Numerous accidents have been reported on routes 219 and 86, as well as other roads in McKean, Cattaraugus, Elk and Potter counties.
Traffic on I-86 going toward Olean is traveling at about 10 miles an hour.