MTB's have really long handlebars coming off of those stems. Road bikes typically do not. Road bike length is wherever you're grabbing the bar then drawing a line from there to the center of the steerer. So a shorter stem will decrease that effective length for steering.
Almost all road bikes have toe overlap, you're going that slow and tight learn to keep the feet there and coast OR just tap the cranks up and down without going all the way around when making the u-turn.