To exemplify this design concept, I'll be using Cities: Skylines, a city-building game with a lovely traffic simulator. Part of the challenge in starting a new city in the game is designing the road system to handle higher traffic volumes later. You're limited in cash, road size, and you have no mass-transit options. At first, you can only build a two-way street, then you get one-way streets, avenues, and boulevards. You can't extend or change the highway. Here's how you design your first few roads so that, even late in the game where you'll have high populations and lots of industry, your traffic will still flow smoothly.
- Connect the highways together with a two-way street. This gives you a quick way to unlock the one-way streets, which is vital for the next step. (You can change the two-way to a one-way later.)
- Using one-way streets, create a counter-clockwise loop big enough to place avenues or boulevards on each of the three remaining cardinal directions. Right turns means almost zero wait times at intersections.
- Place avenues left and right, and a boulevard towards the center of your city plot. Don't go too far with two of them, you only need one long one for the residential development.
- Your industrial should get priority nearest the highway connection. Then a small plot of commercial to separate the industrial and residential. Then place residential along your long avenue.
- You'll want to try and drive your residential development towards a water source so you don't have to build too many power lines, and your pipe will service everyone from the source to the industrial.
- If you've done it correctly, it should look something like this!
|The avenues lead to a water pump and sewage drain, and the power plant never runs out of fuel.|