Is it just the size of vehicles or the design of the streets and roads also to blame? The "stroad" which we seem to love here in Canada and I'd assume the USA

Is it just the size of vehicles or the design of the streets and roads also to blame? The "stroad" which we seem to love here in Canada and I'd assume the USA is dangerous by design. Roads should be simple, medium speed, no traffic circles, few traffic lights, controlled access, no driveways exiting onto it, no bike lanes, no sidewalks, no crosswalks, no bus stops etc. Streets should be simple two lane, slow speed, more pedestrian friendly. But often the two are often mixed together meaning both pedestrians and traffic efficiency suffer.