https://www.thinkinsure.ca/insurance-help-centre/ontario-graduated-g-g1-g2-licence-system-guide.html
G1 Rules And Restrictions
As a new driver, there are certain G1 road rules you must abide by. G1 rules are in place to help new drivers learn how to drive safely and effectively.
The following G1 restrictions apply :
Must be accompanied a full G licenced driver : You can only drive when you have an experienced G licence driver in the passenger seat.
Accompanying drivers must have a full G for at least 4 years. They must have an alcohol level of less than 0.05% if over 21. If under 21 they must have zero blood alcohol level.