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Set of Roads for Turbo Roundabouts

This is a set of four roads to easily create Turbo Roundabouts. Their main features are:

• continuous white lines between lanes
  
• no crossings on the inner node
  
• arrows
  
• no inner pedestrian pavement so citizens won't cross inside
  
• outer pedestrian pavement activated, so you don’t have to build overpasses or underpasses.
  
• no parking
  
• no zoning on either side so it doesn't mess up the zoning on your main roads.

No props will show up, except one street light per segment on the outer pavement. The 2-lane version also has hatched markings to allow large vehicles to manoeuvre easily.

Turbo Roundabouts require drivers to choose their direction before entering the roundabout. Unlike standard multilane roundabouts, the lanes are marked with continuous white lines rather than dashed lines.

The roads themselves work without mods, however, TM:PE and Intersection Marking Tool are necessary to control the traffic AI and to detail the junction depending on how you decide to set up your roundabout. Using these roads with no mods will still give you the above-mentioned benefits, but the roundabout will look like the Step-1 picture.

The set comprises 4 roads:

• a 2-lane roundabout road with hatched markings, for 3-legged roundabouts or quiet 4-legged roundabouts;
  
• a 3-lane roundabout road;
  
• a 3-lane roundabout road with bike lane; 🚴‍♂️
  
• a 4-lane roundabout road for 5-legged roundabouts or busy 4-legged roundabouts.

The 4 roads share the same _d, _p and _r maps (wherever possible), so they're compatible with the Loading Screen Mod.

Here's a quick tutorial:


Build a roundabout with one of these roads. The segments will have arrows, continuous white lines, crossings deactivated on the inner node and no zoning.
You can also use the Roundabout Builder.



With TM:PE, allow vehicle to enter a blocked junction. You don't need to deactivate pedestrian crossings as they are already deactivated.

Tip: the outer node depends on the road you choose as the approach road. If you don't wish to have crossings on the outer node, you can choose Highway Roads or Hide Crosswalks.



Set priorities.



Connect lanes. Turbo Roundabouts usually use the outer lane as exit lane, and the other lanes will step down on position.

You can use a 2-way 2-lane road like the one in the picture, but for busier roundabouts you should use 4-lane roads or 1+2 or 1+3 roads. Turbo roundabouts may have different lane connections depending on the traffic level of each lane. You can google real life turbo roundabouts for inspiration.

Tip: turbo roundabouts usually don't allow drivers to use the roundabout to perform U-turns. If you wish to give your drivers that option, you can connect the outermost lanes.



Finish by detailing the node with the Intersection Marking Tool.
Use solid lines for when the lanes don't cross each other and dashed lines when the approaching lanes cross the roundabout lanes.


Tip: large roundabouts (diameter ≥ 14u or radius ≥7u) will automatically trigger a node between junctions. Use the Lane Connector (ctrl+S) to prevent cars from switching lanes.

I made the continuous white lines so that their position and their colour match those of solid lines of the Intersection Marking Tool.

Same as vanilla one-way two-lane road. Basic elevation only.


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