Drivers should watch for school children and traffic.
The heaviest morning traffic was seen near the Lakeside and Greenbrier school zones, where three schools - elementary, middle and high schools - are clustered together.
The school day began between 7:35 and 7:50 a.m. for middle and high school students. Elementary schools started at 8:30 a.m.
The speed limit in school zones is 25 miles per hour.