UPDATE: As of 11:45 a.m. on Jan 9, all speed and vehicle restrictions across the Midstate have been lifted. However, motorists are advised to keep alert for icy conditions on roads.

HARRISBURG, Pa, (WHTM) — Ahead of frozen precipitation and potentially icy conditions on roadways on Sunday, Jan. 9, PennDOT and the Pennsylvania Turnpike Commission are advising motorists to avoid unnecessary travel during the storm.

The agencies implemented various speed and vehicle restrictions ahead of the winter weather. As of 8:30 a.m. on Sunday morning, some of the vehicle restrictions have been lifted across the Midstate.

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Tier 3 vehicle restrictions have been removed on I-83 in Cumberland, Dauphin, and York Counties. It was originally put into effect at 2:00 a.m. on Jan. 9.

On roadways with Tier 3 restrictions in place, NO commercial vehicles are permitted, EXCEPT for loaded single trailers with chains or approved Alternate Traction Devices.

In addition, all school buses, commercial buses, motor coaches, motorcycles, RVs/motorhomes, and passenger vehicles (cars, SUVs, pickup trucks, etc.) towing trailers are not permitted.

Tier 4 vehicles restrictions have also been lifted from I-81 in Cumberland, Dauphin, York counties. However, they do remain in place in I-83 in Lebanon County and on I-81 from I-83 Dauphin County through Lebanon County to the Schuylkill County line.

On roadways with Tier 4 restrictions in place, NO commercial vehicles are permitted. All school buses, commercial buses, motor coaches, motorcycles, RVs/motorhomes, and passenger vehicles (cars, SUVs, pickup trucks, etc.) towing trailers are not permitted on affected roadways while restrictions are in place.

There is also a speed restriction of 45 mph at the time the vehicle restrictions are in effect.

For up-to-date traveler information, motorists are urged to use the free 511pa.com service or by using the free 511pa mobile app. For more information about vehicle restrictions, click here.