Lane Arrows
Overview
Lane arrows can be used to organize traffic flow across road junctions and level crossings.
Usage
Choose Lane Arrows on the Toolbar 
You can set a keyboard shortcut to activate the tool in the Key Bindings in Settings.
Applicators
Click a road segment at a junction to edit it.
A panel appears showing arrows for each lane:
Click arrow buttons to toggle direction on/off for the associated lane.
Limitations
Lane arrows can't be changed on junctions using:
Lane connectors take precedence over lane arrows.
See: Enable highway-specific lane merging/splitting rules in Policies Settings in Settings
You can use Lane Connectors to override such junctions
Vehicle Routing
Vehicles calculate their route before starting their journey. As a result, when you change lane arrows, only vehicles spawned after that point will be aware of your changes.
To force existing vehicles to calculate new routes when you make changes, enable Apply AI changes right away in General Settings in Settings.
Shortcuts
The following shortcuts are applicable when the Lane Arrows tool is active...
Selection:
Click a segment entering a junction— choose segment to customizeAny previously selected segment wil be deselected
Right-click anywhere— deselect current segmentIf no segment selected: Exit the Lane Arrows tool as if you pressed
Esc
Esc— exit Lane Arrows toolReturns focus to the Toolbar and enables its Adjust Roads mode.
Basic Applicators:
Click an arrow button- toggle the direction on/offDeleteorBackspace- reset selected segment arrows to default state
Bulk applicators:
Alt+Click segment entering a junction- Automatically configure turning lanes for that segmentRepeat the shortcut to cycle through alternate configurations
Control+Click a junction- Give all roads at the junction a turning laneSame as
Alt+Click, but configures all segments entering the junctionRepeat the shortcut to cycle through alternate configurations
Priority Signs bulk applicators can add turning lanes for an entire route
Camera / Overlays:
Mouse wheel- zoom in or outPageDown- underground viewThis activates a simplified version of the Traffic Info View
PageUp- overground view
Notes
Unlike Lane Connectors, which explicitly link an incoming lane to one or more outgoing lanes, the lane arrows just set a general direction.
(todo: image)
You could think of this as an arc drawn around the edge of the junction, and depending on the lane arrow the arc will be mostly to the left, ahead, right, or a mixture of those. Any road containing outgoing lanes that is within the arc is seen as a valid exit from the junction.
FAQ
Does it affect frame rate or cause lag?
Vehicles are ignoring the changes I made
Lane arrows are causing buses to take strange routes
Painted road arrows are not reflecting my changes
When I load my city, my lane arrow customizations are gone
Can I customize the painted road arrows?
See Also
Priority Signs-- bulk applicators can set lane arrows
Lane Connectors-- a more powerful way to control traffic routes through junctions
Junction Restrictions-- additional settings for junctions
Policies Settings - allow buses to ignore lane arrows
Guides:
