I know their school buses are on the Columbus Public Safety system. I listen to them all the time mostly in the mornings when they're picking kids up and then again in the afternoons. Note that they're not under the SAFET system on RadioReference but they are under Columbus Public Safety 855.4625, 856.4625, 857.4625 858.4625, 859.4625, 855.7375,856.2625 are the trunked frequencies RR lists. Also there is I believe the hospital, trash trucks, city buses and so on.