How school zone speeding fines are determined in Sask.

Back to school traffic safety WATCH: As thousands of students head back to school, SGI and police reminds people to slow down in school zones. Stacey Hein reports.

Combined Traffic Services Saskatchewan (CTSS) is reminding drivers that speeding through school zones will come with a hefty fine.

In Saskatchewan, fines can reach as high as $798 for those caught going barrelling through a school zone at an unsafe speed.

In both Regina and Saskatoon, school zones are in effect from 7 a.m. to 7 p.m. every day of the week all year long. The speed limit is 30 km/h.

Even going just 5 km/h over the limit can net a substantial fine of $250.

The rates only escalate from there, according to a tweet sent by CTSS:

CTSS said most drivers are caught going 55 or 60 km/h through school zones.

"Police tolerance for going anyone going over 30 km/h in a school zone is very limited. Drive accordingly," CTSS said on Twitter.