You gotta love the americans. Their strict adherence to the grid pattern for their city layout leads to some interesting situations. San Francisco is a good example of this. The city does have flat bits (for which the grid pattern works well) but they also have a few hills. These hills aren't your little pimples either. They are dirty great steep sided mounds of rock.
In England, the streets would follow a winding path up the side of the hill, keeping the gradients nice and smooth so you could get your horse and cart easily up to the top. (You do own a horse and cart, don't you? You don't? What century are you living in?)
In SF they do things differently. They have adopted the very roman approach of just taking the road up and over and to hell with the gradient*. This results in some pretty interesting climbs .. even for the modern car. What makes it more interesting is that the 45 degree slope is crossed at right angles by other roads, so the road has to flatten out to accomodate the crossover before continuing its downward plummet (sorry, descent). One road I walked (breathlessly) up must have had delusions of being the percussion section of a band, since on a regular beat you would hear what sounded like a clash of some hung over geriatric cymbals. On closer inspection I found it was a junction where any car going over the speed of 1 mph took its rear end out with an expensive sounding scrape.
At some points the road builders had taken one look at the gradient, sworn at the twon planner, resolved to bring him out and bury him under the sidewalk and just given up, replacing the road with a set of steps. Once they've managed to accomodate the necessary gradient they have then continued with the road further on as if nothing had happened. This is fine if you are on foot, but if you are in a car life must be one long series of exciting detours.
Of course, the layout does have its upside. You want a car chase? Have it in San Francisco; one long series of death defying slopes, dead ends and cable cars to negotiate. Walking (puffing) around SF I expected any moment a car to emerge from a side road trailing cop cars and performing air jumps at each crossover.
Hasn't happened yet, but one can hope.
Alternatively, I could rent a car and try it myself.
*Except for Stockton where they chickened out and put in a tunnel. And Lombard, where they'd clearly had a bit too much to drink at lunchtime.