There was a question on the maximum number of occupants in a vehicle in Oklahoma. Now I have an issue:
My wife will be driving to Canada with our friends the car she wants to drive is an SUV with 2 rows(2 in the front and a bench in the back).
I was wondering if seating 1 adult and 3 kids in the back will be an issue crossing the US-Canada border?
It is illegal to drive a vehicle in the US where each passenger does not have a seat belt (with very few exceptions) - http://www.nhtsa.gov/staticfiles/nti/pdf/811458.pdf
It is illegal to drive a vehicle in Canada where each passenger does not have a seat belt (with very few exceptions) - http://www.mto.gov.on.ca/english/safety/seatbelt.shtml
Your vehicle apparently has 3 seats belts in the back seat.
You are asking if it's going to be a problem to carry 4 passengers in the back seat.
The answer is fairly clearly, yes, this will be an issue crossing the border as you will be breaking the road rules on BOTH sides of the border.
No problem provided the vehicle is within rated capacity and everyone is belted/safety-seated in.
The kids (if young) should have approved car seats (though if they're not obviously decrepit, anchored properly and of the proper type such as rearward-facing for infants I don't think anyone is going to check the stickers). Here are the rules for Ontario.
