What's a good strategy for dealing with traffic?

Question

I've placed some medium and high-density roads between the ultra-pollution industrial side of the city and the medium density residential/commercial side of the city. Now my city is at a size where all those roads are filled with traffic every day. And unfortunately I also built some low density R/C zones on these east-west connectors.

How should I handle this? Add a new larger connector between them? Bulldoze the existing road and make it bigger (removing the existing infrastructure along it)? Busses? I have lots of space available still.

Answer 1

In SimCity, there are two different types of road. These are streets and avenues.

Streets are one square wide and avenues are two squares wide. All streets are the same width, so a dirt road can be upgraded to a high density street using the upgrade road tool.

In order to upgrade a street to an avenue, however, you need to destroy the old street and replace it with a larger avenue, which will remove all infrastructure that exists along the old street.

If you're in a situation where you already have the maximum capacity version of a particular style of road but don't have the space to replace it with an avenue, there are other options available. It is possible to build additional roads within the vicinity to alleviate the amount of traffic travelling down your currently over-crowded road. To do this, bring up the traffic data layer to see where all of the traffic is coming from, and build new roads that intersect the busiest streets to provide additional routes for your sims to travel down. The traffic data layer can be accessed using the 'All Data Maps' button in the bottom right of the interface, or by toggling the 'upgrade road' option.

In addition, there is the possibility of setting up mass transit. Mass transit works by building a depot (and adding additional trucks as required to increase the number of sims that can travel per day and reduce the wait time for busses) and placing stops. The region that a stop will cover is highlighted along the roads as you place the stops. For the maximum effect you will want to place stops along your busiest streets (see your data layer for traffic again) and ensure that the wait time for passengers is managed to ensure it doesn't get too high.

You can monitor wait time by bringing up the information screen for your mass transit depot, and you can monitor the amount of traffic a particular stop is attracting by bringing up the information screen for each individual stop.

Answer 2

Look at the bad intersection, are cars piling up behind a stop sign? Replace that with a stop light by upgrading the road.

LDS = low density street. MDA = medium density avenue. HDS = high density street.

Say you have a LDS intersecting a MDA. The MDA will have no stop, and the LDS will have a stop sign. Delete two segments of the LDS closest to the intersection and replace it with HDS.

Now, the main intersection will have stop lights, and the conversion intersection will have no stop. The stop lights will ensure your street gets a turn to unload its traffic, while the conversion intersection will keep your U-turn traffic out of that main intersection.

The downside is the MDA now has a stop light where it had no stop before.

Answer 3

If you have a tight grid with lots of intersections, the intersections themselves can slow traffic down. Removing every second road (sometimes needing to demolish buildings) can ease the business of the intersections and improve traffic congestion a bit.