Best roads would be this ..
Straight up hwy 12 into Port Perry.
Follow Port Perry across the causeway which is hwy 7.
Just past Blackstock, turn left onto #57
When you come into that little town, turn righ at the stop which is #57 continuation.
If you follow that it will take you just out side of lindsay to Hwy 35.
Hwy 35 to Hwy 7 right into Peterborough.
Nice little ride for sure .. and a couple twisties as well.
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