TULSA, Oklahoma - City of Tulsa City road crews reported to work at 4 a.m Monday and are out making sure streets and roads not treated on Sunday are getting sand and salt.

The city says it has more than 60 mounted sand-salt spreaders and 56 plow vehicles. Most of those vehicles have been assigned to 35 specific routes totaling more than 1,768 miles. The City of Tulsa says it prioritizing those routes based on the amount of traffic they get and their proximity to vital facilities such as hospitals.

The Oklahoma Department of Transportation reports isolated slick spots in the Tulsa metro with snow falling across the region. News On 6 has received a few reports of wrecks Monday morning.

A pickup hit the back of an ODOT sand truck on Highway 75 near Southwest Boulevard. The driver told Oklahoma Highway Patrol troopers she slid on black ice. No one was injured in the crash.

ODOT reminds drivers to stay at least 200 feet behind road clearing equipment.

Farther south, ODOT has trucks out south of I-40 like Highway 69 near McAlester treating highways and bridges.

The National Weather Service has issued a Winter Weather Advisory for all of eastern Oklahoma until 6 p.m.  The NWS says 1 to 3 inches of snow could fall before tapering off Monday evening.

Because of snow that fell on Sunday and current weather conditions across southeast Oklahoma a number of schools have canceled classes for Monday.

Tulsa International Airport website is showing a number of American Airlines and Southwest Airlines cancellations between Tulsa and Dallas because of snowy weather in the Dallas area Monday.