CULLMAN, Ala. (AP) — An Alabama interstate blocked by wrecks after a snowstorm has been reopened north of Birmingham.

Hundreds of people spent a freezing night trapped on Interstate 65 in Cullman County after as much as 4 inches of snow caused a series of wrecks that snarled traffic for miles.

Alabama state troopers say the interstate was reopened in both directions by 9:30 a.m. Friday.

But it may take time for traffic to move freely again because of the size of the blockage.

Daytime temperatures rose above freezing, improving road conditions.

Traffic had backed up at least eight miles on the northbound highway, which links Birmingham and Nashville, Tenn.

Motorists posted on Facebook and Twitter about being trapped for 10 hours and more without food or bathrooms.