The cameras are operational from 7:20 a.m. until 4:15 p.m. When school zone sign lights are flashing (7:30 am. until 8:30 a.m. and 3 p.m. until 4 p.m.), drivers must decrease their speed by 10 miles per hour. Speeds in front of the middle school change from 60 mph to 50 mph when school zone sign lights are flashing. The speed limit at the front entrance of the high school (across from Northview Cemetery) is 45 miles per hour, no matter the time of day or day of the week.