Start at the front of the queue
Trace a queue from its front: check the next movement, lane connections and the receiving road or station. Diagnose a tram-train transition separately from ordinary road congestion.
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Sources, dates & scope
Updated October 19, 2026 from the road manual; replaced unverified overtaking fixes with a location-based diagnosis.
ROAD AND MIXED-ROUTE CHECKSThe road manual describes overtaking when multiple lanes serve the same destination. The crossing tool controls allowed lane connections; traffic-light phases can be edited. A wide road alone does not show that every lane serves your vehicle's next movement.
Official source: Urban Games manual · Streets and Tracks ↗Source date/status: Checked October 19, 2026. Check the linked source for its current details.Additional source: Urban Games · Infrastructure developer explanation ↗
| Where movement stops | Inspect first | Avoid changing first |
|---|---|---|
| Behind a slow vehicle before a turn | Whether another lane serves the same turn | The entire fleet's top speed |
| At a junction with a clear exit | Allowed lane connections and relevant light phase | Several unrelated junctions |
| At a junction whose exit is full | The blockage downstream | Green duration alone |
| At a station entrance | Access and what is occupying the destination | A clear road farther away |
| At a road-to-rail transition | Vehicle compatibility and connection | The whole urban network |
A fast vehicle is following a slow one: where does the queue begin?
Begin at the front of the queue. Is the lead vehicle waiting for a junction, a station entrance or another stopped vehicle? Follow its next movement rather than inspecting only the faster vehicle behind it. This separates a blocked exit from a question about lane choice.
Next inspect the lanes that can reach that destination. The manual's overtaking description is conditional, so ‘there are two lanes’ is not a complete diagnosis. Our first check would be whether the apparently unused lane leads to the required turn. If it does not, buying a faster vehicle does not make that lane useful.
If the lanes appear usable and the behaviour persists, preserve the save and record the build, vehicle, road section and next stop. A short reproducible case is more useful to support than an assumption that all overtaking is broken. This page does not confirm a universal traffic bug or a priority-setting workaround.
Inspect the junction before adding width
Draw the desired movement as an approach lane and an exit lane. Check whether your crossing configuration permits it. For a traffic-light junction, select the lights to inspect their phases. Look at the queue during the relevant phase and ask whether vehicles can actually clear the junction.
Our suggested experiment changes one thing: a lane connection or a light phase, not both along with a new road. Keep the previous layout saved. If the exit remains blocked, longer green time cannot create somewhere for vehicles to go. If the route becomes unavailable, undo the change and check connectivity before tuning throughput.
This is also why screenshots of attractive interchanges make poor universal fixes. They may not contain your stop entrances, turning demand or receiving road. Copy the reasoning behind a movement, not only the shape of the junction.
Choose between routing and construction
Consider three candidate changes separately: alter which movement uses the junction, change the junction's permitted movements, or create additional physical space. Each solves a different hypothesis. The comparison table gives a first inspection rather than an automatic build order.
Example, purely illustrative: delivery vehicles queue outside a terminal while the next road section is clear. Widening that clear section would not explain why the terminal entrance is blocked. First inspect the destination and its approach. Conversely, a queue ending at a busy crossing suggests a different investigation from a queue ending inside a station.
After an experiment, watch both the affected service and traffic sharing its approach. Moving the queue onto another road is not the same result as reducing it. Keep any intervention only when you can describe what improved and what became worse.
A tram-train fails at the transition: check compatibility separately
The infrastructure developer explanation says only suitable light-rail trams can continue onto railway tracks. They use street rules on roads and railway signaling on rail. Do not assume every tram, or an ordinary train, is interchangeable across both networks.
Break a mixed route into three checks: the urban section, the transition and the railway section. If the service works before the transition, inspect the chosen vehicle and the next connected segment before rebuilding the city streets. If it reaches the railway and waits, switch to the rail-signal checks rather than continuing to adjust road traffic lights.
Keep the first mixed route short enough to trace end to end. Adding several branches before this basic passage works makes a compatibility failure harder to distinguish from a path or signaling problem. We do not have a verified model-by-model tram-train compatibility list; check the selected vehicle's in-game properties before committing the route.
Road controls were checked in the official manual on October 19, 2026; tram-train behavior is attributed to the infrastructure developer explanation. The diagnostic order is our analysis, not a reproduced traffic fix.
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