Canadian usage is exactly as US. Traffic circle, trunk, rent. But on the other hand, while we're familiar with the alternatives, native Canadians don't use them, at least not here in the west.

- New Jersey is the home to traffic circles in the United States. Also, you should be on the look out for jug handles.
3. We do not use "hire a car" at all here. It still sounds funny to me. "Hire" is mostly used when you pay somebody to do something for you. You rent a car and hire a driver.

Traffic circle or roundabout, they both work (it's a rare phenomenon, but luckily becoming more common)
It's a trunk whether its front or back. Front ones are rare, and tend to be on older models and hippy types (ie the vw squareback)
Rent.
& US, west coast raised, west interior worker.
I have had a few americans ask me what a 'roundabout' is. in Vermont it is called a Rotary. I have also heard Traffic Circle.

"You can be of use today.
I need to find the standard American terms for a few thingies.
1. Traffic circle
Is that right? In England we call it a roundabout. I've got a feeling you know what that is but usually it's a traffic circle, yes?
2. Back trunk
At the back of the car there is some storage space for a spare tire, oil-stained rag and a few empty chip packets. Is this a back trunk?
3. Hire a car
In England we say "rent a car" but I've got a feeling that Americans talk about "car hire". You go on holiday to France and you decide it might be nice to have a car for a few days. "Honey," you say. "Why don't we hire a car for a few days?" Is that right?"
1. In the West Midlands (West Wastelands more like) of England a roundabout is called a 'traffic island'.
2. All over UK/DQ they talk of 'car hire' - e.g. in 1983 in Aberdeen I hired a car from a company called 'Hire a Heep'; it rented old cars for about one-third the price of Avis 'et al'.

London is also dotted with 'mini-roundabouts' - painted onto the road, or slightly raised - designed to keep traffic flowing more freely.

#8, there is an exception to your statement. In Norht America, if you get a car with a driver, you hire the car. One of the rental companies is called "Thrifty Car Hire". It just get confusing but there is no doubt that North Americans Rent a Car and to some extent I have heard people talking about renting a car in the UK. Ah but they were probably North Americans anyway!!