Trafficity Roads and Traffic Lights: Lanes, Roundabouts and Highway Interchanges

Trafficity roads and traffic lights let you do more than put down a junction and hope cars work it out. You can add individual lanes, change the way vehicles turn, adjust signal phases and build roundabouts or highway connections when a busy crossing stops working.

Trafficity launches on Steam on 16 November 2026. Its traffic simulation follows individual cars as they choose routes, so one change at an intersection can affect queues elsewhere in your city. Here’s how the road tools fit together and what to look at when traffic begins to back up.

Trafficity roads and traffic lights: the main building tools

Road layouts are not tied to a fixed square grid. The developer’s three-click road tool lets you draw grids at different angles, while extra lanes can be placed alongside existing roads. That should make it easier to widen a busy approach without rebuilding the whole neighbourhood, although the exact on-screen steps are best checked in the game.

Trafficity roads and traffic lights cover more than ordinary crossroads. Roundabouts, overpasses, highway connections and protected turning phases all appear in the developer’s feature list. The important choice is which kind of junction fits the traffic passing through it. A neighbourhood street and a major road should not need the same design.

Why turning lanes matter

At busy intersections, cars do not all want to travel straight ahead. Some need to turn, and the queue for a turn can block other traffic if the layout does not give those vehicles a suitable lane. Trafficity’s simulation considers vehicles positioning themselves for junctions, so the arrangement of turn lanes and lane connections can change how smoothly traffic flows.

The developer specifically mentions protected left turns and editable lane connections. Giving turning traffic its own phase can keep that movement separate from vehicles travelling in the opposite direction. In Trafficity roads and traffic lights, changing that relationship is one way to tackle queues caused by conflicting turns.

Trafficity roads and traffic lights: adjusting signal phases

Onramp Games says players can change traffic-light phases at intersections. In broad terms, the timing determines how long one movement gets priority before the signal changes for another. That can help when a main road has heavy demand or a quieter side street is keeping a busy route stopped for too long.

A longer green phase for one road might clear its queue, but it also keeps the other approaches waiting. The best setting will depend on how many cars are trying to use each movement. Trafficity roads and traffic lights let you adjust those phases, though the developer has not published an exact timing formula to follow.

Trafficity roads and traffic lights: roundabouts and highways

Roundabouts and highway interchanges give you alternatives to ordinary crossroads. You can also build overpasses and more complicated connections, which becomes useful as the city grows. The sensible choice depends on where vehicles are going, not just how impressive a junction looks.

A roundabout won’t automatically fix every traffic jam, and another lane can simply move the queue further down the road. Cars choose routes based on conditions, so improvements to one junction can change traffic patterns elsewhere. After making a change, watch what happens across the whole route rather than only at the junction you edited.

How city buildings create traffic demand

Residents need to reach work and shops, factories need materials and staff, and commercial buildings need people and deliveries. Every new group of buildings can add more journeys to the network. That is why roads are connected to the simplified city economy instead of being a detached sandbox minigame.

The developer also mentions noise and pollution, so infrastructure has trade-offs for nearby residents. A road change that improves a commute may have a less welcome effect around homes. This adds a reason to think about the neighbourhood around a road, not just how quickly vehicles can pass through it.

What to check when cars seem stuck

When a queue builds, start with the turning movements. Is one lane packed while the others sit empty? Are most drivers trying to turn across oncoming traffic? Would a dedicated turn lane, different signal phase or second connection give them another way through? Trafficity roads and traffic lights offer several ways to test the answer.

Trafficity roads and traffic lights are worth experimenting with because even a small lane or signal change can affect drivers across the city. Start by working out where people are trying to go, and change the junction that’s actually slowing them down. The game is scheduled to launch on 16 November 2026.

Official source: Onramp Games on Steam.