You can drive anywhere with a G2, including the 400 series highways, but you have restrictions on your blood alcohol level and the number of your passengers, you can read more below about G2 and G1 licensing restrictions.
Ontario, Canada has a graduated licensing system. This graduated licensing process lets new drivers get driving experience and skills gradually. The two-step licensing process takes at least 20 months to complete.
With a G1 license there are certain restrictions placed on the driver. One such restriction is that the driver must refrain from driving on Ontario's "400-series" highways or on high speed expressways such as the Queen Elizabeth Way, Don Valley Parkway, Gardiner Expressway, E.C. Row Expressway and the Conestoga Parkway.
When the new driver has completed the G1 road test and progressed in their driving skills so that they can obtain their G2 license there are less restrictions placed on the driver. While there are still some restrictions in place at this level, the driver has more privileges because of their driving experience. Now as a G2 driver you may drive without an accompanying driver on all Ontario roads anytime.