This article is timeless and should be accurate for any version of the game.
This page is intended as a list of tips that might not be entirely obvious to newer players of Cities: Skylines, but which once explained can make the game more enjoyable.
Roads & rails
- Creating a highway that will be the "spine" of your city can be beneficial for the traffic flow; however, a proper road hierarchy is needed in order to maintain the flow in the city and on the highway.
- Sometimes you will need a way to diffuse heavy traffic from the highway/freeway; for that you can use frontage roads or local-express roads.
- The fewer intersections the better. Also try to avoid traffic lights as they disturb the flow. You can do this by, for example, transforming the road to highway.
- Strategic roundabouts shouldn't be small (the smaller the roundabout, the more the cars have to slow down, thus causing a decrease in the flow of traffic).
- Use one-way streets whenever possible, especially in industry districts, as there is a tendency for trucks to clog the roads. However, keep in mind how services will have to travel to get to buildings on one-way streets. It is possible for a service to be directly next to a building that is inaccessible due to an inefficient road system.
- Remember to connect two lines of highways in a way that people can turn around easily without needing to enter the city.
- Too many roads merging in a small area is bad for traffic flow.
- Try to split your truck traffic away from your commuter traffic. Having both loads of traffic on the same roads can quickly snarl even well-designed traffic systems. Creating a district with the Heavy Traffic Ban can help accomplish this.
- Use cargo rail in industrial districts—they will greatly help develop the district and remove part of the traffic. Remember that a good road system is needed to serve the cargo station, as every time a train arrives, a lot of trucks are moving the goods to their destination. (One-way streets are one of the solutions here)
- Railways can get congested, just like roadways. To help prevent railway congestion, it may be beneficial to segregate freight and passenger lines. Additionally, bypasses can be made to go around stations. When creating rail intersections, it's best to join them in such a way that a full train can fit on the interchange, which will allow following trains traveling to a different destination to continue unimpeded.
- Great ideas for intersections can be found here: http://en.wikipedia.org/wiki/Interchange_(road)#System_interchange. If you still have trouble, you can get out a piece of paper and draw some intersections you think are best. If you live near a highway or city, take a look at the interstate intersections. Most likely those will help out.
The main purpose of public transportation is to reduce traffic by offering your citizens an alternative to driving, and is essential for creating an effective city.
- Start using public transportation as soon as possible, and try to keep the lines simple.
- Buses can be quite inexpensive and effective, but too many buses overlapping can cause congestion.
- Metro is the most effective transportation system, but it is also quite costly. A good mix of buses that complement a metro system is the most effective overall solution.
- Passenger trains are currently not especially useful for transport within a city, though can be useful for bringing tourists to the city. They become more effective in large, sprawling cities that are widely dispersed. However, it can be a good idea to use dedicated passenger railways to prevent congestion of freight trains.
- Increasing the funding of a particular type of public transportation will increase the number of vehicles used on every line of that type.
- Longer lines with more stops will spawn more vehicles.
- Public transportation stops is a type of service and can be used to increase happiness and building level.
- Public transportation lines are most effective when their routes pass through all types of zoning (except office since they are not much burden in traffic).
- Commuter traffic are most common in commercial area and industrial traffic are more common between industries and occasionally, between industrial and commercial areas.
- Public transportation is in highest demand within commercial areas; even more so with commercial specialization.
- Note that services have a finite range, so you will need to disperse services throughout the city. The associated infoviews will show you which parts of the city are within range.
- Services not only have a range, but they rely on the roads to get to where they're needed. Heavy traffic congestion or poor road layout can heavily reduce or totally negate service effectiveness.
- Certain service buildings, such as landfills and cemeteries, must be completely empty to relocate or be bulldozed. Garbage or dead bodies can be reallocated to other facilities by using its service vehicles for the tasking instead of normal collection duties.
- Don't put water intakes downriver of sewage outlets or water towers on polluted ground.
- Parks and services increase land value, increasing popularity of given land, as well as stimulating those areas to develop.
- The optimal pipe coverage is $440 worth of pipe between two parallel pipes, which will result in the smallest possible amount of overlap between the zones of coverage of the parallel pipes, whilst still ensuring everything gets served with water and sewage.
- Power lines don't need to extend all the way to a building, only to the blue outline seen in the power overlay.
- Make use of districts and city policies. More here: Dev Diary 8: Districts & policies
- Try to separate pollution-heavy buildings/industries from residential areas.
- Agriculture and forestry industry produce no pollution, and you can utilize them even if the area doesn't have natural resources of that type. (They'll just import what they need.) You can use these as buffer zones in between your industry and commercial zones. They do have significant noise pollution (as does all industry), but commercial is much more willing to put up with noise pollution than residential is.
- Pedestrian and bicycle paths: Just because they are under the "decorations" section does not mean you should write them off as just decorative fluff. They are legitimately useful in cutting down your traffic. A resident walking or biking to work is one less car clogging your road. It's like free mass transit. You can also make pedestrian and bicycle paths elevated the way you can elevate roads. They permit steeper inclines than even the smallest roads.
- Building orientation tip: The orientation between two roads that are in a 90-degree angle to each other happens by moving the mouse pointer towards the road that you want the building to face. So if you have a corner with a large road and small road and you want the shopping mall to face the large road, you can first move the mouse to the spot you want it in and then slightly move the mouse towards the larger road and the building will orient towards that.
- Roads with decorative trees or sound barriers can reduce noise pollution.
- Offices can be used as a barrier between commercial and residential areas to reduce noise in residential areas.
- Zoning plays an important role in traffic. To isolate commuter and industrial traffic from each other, zone commercial area at the middle, residential and industrial on either side of commercial area. Offices can be zoned anywhere since they simply provide jobs only and are less burden on transportation system.
- DO NOT expand your city too quickly at the very beginning, because your budget will get drained earlier than expected; it is enough to start with a residential area, electricity, waterworks and sewer.
- Save your city before you build a dam as sometimes the results might be different from your expectations. Dams are one of the most expensive buildings in the game.
- Browse the Steam Workshop for cool mods, as well as fancy intersections that will, in general, improve the flow in some critical places.
- You can use http://terrain.party/ to obtain a height map of your city of choice and import it into C:S. Instructions are posted here.
- Don't buy something until you need it—most things have an upkeep cost. If you can get by without it for a while, you will build more reserve money when you need it. The exception to this is the beginning of the game where you want to expand quickly to put your budget in the black (or green, as it were).