Hell, my father used to have a fairly common French sedan that would sometimes need a lot of maneuvering through the public garage ramps, and would barely fit in the parking slots.
Road tax depends heavily on the vehicle. I think we pay ~€1000 a year, ~€83 a month, for our Hyundai ix35.
* Electric Cars are exempt from both IIRC.
* Diesel is mostly front loaded in the yearly road tax. With a very low tax on fuel. So if you drive a lot it is worth getting a Diesel for this reason alone.
* Petrol has a lighter yearly tax. There is a formula someplace and it has to do with engine size, weight, age and some other things assuming I understood correctly. The yearly tax is cheaper on average than the diesel. Then there is a large tax on petrol. About €0.17 a liter or €0.642 a gallon.
For example, you can't attach animal guards here to pickup trucks, and you need extra reflectors and different lighting configuration in US for all cars.
While not directly related to safety standards, intelligent active matrix LED lighting systems are illegal in US, too.