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Tools and Upgrades

By ScotPublished Updated Sources checked

Tactical Quick Answer

At the end of every in-game week you choose between two packages. Both hold road tiles, but only one is guaranteed to carry a special tool, and the road-only option carries more tiles. The motorway is the most powerful tool because it passes over roads, buildings, and water and ignores the traffic underneath, though mountains stop it and you can hold only nine per map. Roundabouts fix high-volume ground crossings, and traffic lights are better than their reputation at busy three-way merges.

At the end of every in-game week you get a Budget Increase and choose between two packages. Both include road tiles, but only one of them is guaranteed to carry a special tool. The other is often road tiles alone, and that road-only package carries noticeably more of them. Knowing which tool to pick and when to deploy it is the key to managing late-game traffic.

Motorways​

The motorway is the most powerful tool in the game. It creates an express lane that passes over roads, buildings, and water, and ignores the traffic underneath it. Mountains are the exception, since nothing crosses a mountain except a tunnel.

  • Primary Use: Connect a distant cluster of houses directly to a high-demand destination of the same color.
  • Bypassing Congestion: If you cannot segregate two colors on the ground, use a motorway to pull one color entirely out of the local street network.
  • Free to Run: A motorway costs zero road tiles no matter how long it is, unlike a bridge or a tunnel. The package that carries one gives you the fewest spare tiles because of it.
  • The Nine Cap: You can hold at most nine motorways on a map, and once you have all nine the game stops offering them. There is an achievement, Mom's Spaghetti, for having all nine in use in a single game.
  • When to Pick: Until you hit that ceiling, take the motorway unless you desperately need a bridge or tunnel for survival.

Roundabouts​

Roundabouts are the best way to handle high-volume intersections on the ground.

  • Continuous Flow: Unlike standard intersections, cars entering a roundabout do not come to a complete stop if the path is clear. They yield, merge, and exit without the full junction penalty.
  • Priority Runs Backwards: Cars already circulating give way to cars entering, which is the reverse of the real-world rule. A roundabout fed by one dominant stream can therefore gridlock under heavy load. It is a throughput upgrade over a plain crossing, not an uninterrupted road.
  • Placement: Use roundabouts to connect three or four heavy traffic streams. A motorway endpoint cannot attach directly to a roundabout or to a traffic light intersection, so leave a tile of clearance if you plan to land one nearby.
  • Footprint: A roundabout draws as a 3x3 block, but placement only checks five tiles: the center and its four orthogonal neighbors. A building sitting on a diagonal corner does not block you. Existing road does not block you either, and only buildings do, so dropping dummy road tiles early is the reliable way to hold a junction open before houses spawn around it.

Bridges and Tunnels​

Mountains are absolute. A tunnel is the only way through one, and not even a motorway crosses a mountain. Water is softer, because a bridge crosses it and so does a motorway.

  • Map Specific: The necessity of these tools depends heavily on the map. Zurich needs tunnels through its mountains and bridges over the Limmat, while Los Angeles asks for bridges across the harbor and its two rivers. Zurich, Rio de Janeiro, Mexico City, and Wellington hand you a free tunnel at the start of a run. Reykjavik carries more water than any other map.
  • Resource Heavy: Tunnels and bridges consume road tiles equal to their length, which motorways do not. Always make sure you have enough regular roads to actually build the connection after placing the bridge.
  • When to Pick: Take these only when the geography forces your hand. If a new destination spawns across a river and you lack a bridge, you lose.

Traffic Lights​

Traffic lights have a reputation as the weakest upgrade. High-scoring players disagree, and the mechanics are on their side.

  • A Green Light Removes the Penalty: Cars slow at an ordinary junction to check for cross traffic. A traffic light replaces that check with a cycle, and cars crossing on green skip the junction slowdown entirely. The cost is the cars stopped on red.
  • Where They Work: They are strongest at three-way junctions carrying heavy, lopsided flow, such as two house clusters merging onto one road into a destination. At very high volume they can beat a roundabout, which stalls because circulating cars yield to entering ones.
  • Where They Struggle: At a balanced four-way crossing with several colors passing through, half the traffic is always stopped and the light gives back most of what it saves.
  • Two Per Pick: The traffic light package gives you two lights against a single roundabout, so the comparison is not one for one.
  • Placement: A minimum spacing rule between a light and a nearby driveway or parking lot gets repeated widely, but no source documents any such distance. The real adjacency restriction is that a motorway endpoint cannot connect directly to a traffic light intersection.
  • When to Pick: Take them when you have a specific busy three-way merge in mind, never as a default.

The Value of Basic Roads​

Do not underestimate the package that simply offers more road tiles. It carries noticeably more of them than a package bundled with a tool, and it comes up often. Sometimes you have enough motorways and roundabouts but lack the basic infrastructure to connect a new suburban sprawl. If you are consistently running out of road tiles, take the road package.

Frequently Asked Questions​

What is the best upgrade in Mini Motorways?

The motorway. It passes over roads, buildings, and water, ignores the traffic underneath it, and costs no road tiles at any length. Mountains still stop it, and you can hold at most nine on a map, after which the game stops offering them.

Why can I not place a roundabout?

A building is sitting in the footprint. A roundabout draws as a 3x3 block but placement only checks five tiles, the center and its four orthogonal neighbors, and only buildings block it. A house on a diagonal corner is fine and existing road is fine, so dropping dummy road tiles early reliably holds a junction open.

Are traffic lights worth taking?

More often than their reputation suggests. Cars crossing on green skip the junction slowdown entirely, which makes lights strong at heavy three-way merges and sometimes better than a roundabout at extreme volume. They are weakest at balanced multi-color four-way crossings, where half the traffic is always stopped. You also get two lights per pick against one roundabout.

How far from a destination should I place a traffic light?

There is no documented minimum. A spacing rule of three to four tiles gets repeated widely, but no source supports it. The real adjacency restriction in the game is that a motorway endpoint cannot connect directly to a roundabout or a traffic light intersection.

Should I ever pick the plain road tile package?

Yes, and more often than you would think, because the road-only package carries noticeably more tiles than the bundled ones. If you keep running out of road, take it. You can have plenty of motorways and roundabouts and still be unable to connect a new suburban sprawl.