In separate wrecks, two buses with Metro Nashville Public Schools were hit from behind.
The crashes happened Friday morning. No injuries were reported in either incident.
One took place in the 1200 block of Bell Road. Three students were checked out as a precaution.
Authorities said 20 to 30 students from A.Z. Kelley Elementary School were on board.
The second wreck happened on Old Hickory Boulevard near Burkitt Road. No students were on board during that crash.
