Effective 12:01 am, Tuesday, June 16th, 2020, Post-Thaw Season weights for Heavy Haul and Period 2 weights for Service Rigs will come into effect on roads province wide.

Effective 12:01 am, Wednesday, July 1st, 2020, Summer Season weights for Heavy Haul will come into effect on roads province wide.

Effective 12:01 am, Thursday, July 16th, 2020, Period 3 weights for Service Rigs will come into effect on roads province wide.

Effective 12:01 am, Tuesday, September 1st, 2020, Fall Season weights for Heavy Haul and Period 4 weights for Service Rigs will come into effect on roads province wide.

http://www.transportation.alberta.ca/content/doctype260/production/tr-lhp-frost-thaw-contour-map.pdf