No person shall park a vehicle on a street in a school bus parking zone, except that a school bus may be parked in a school bus parking zone while loading and unloading. The following are designated school bus parking zones:
1. On the south side of Broadway beginning 65 feet west of 16th Street to 226 feet west of 16th Street from 7:30 a.m. to 8:30 a.m. and from 3:00 p.m. to 5:00 p.m. on days when school is in session;
2. On the north side of 2nd Avenue South beginning 110 feet east of 10th Street to 198 feet east of 10th Street from 7:30 a.m. to 8:30 a.m. and from 3:00 p.m. to 3:45 p.m. on days when school is in session;
3. On the east side of 20th Street from the southeast curb of 2nd Avenue North 187 feet south from 3:15 p.m. to 3:30 p.m. on days when school is in session.