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Usage
edit{{#invoke:Road data|function_name}}
Submodules
editSubmodules of Module:Road data are used to process and display the road data stored in the modules listed at #Data modules. There are also a few that contain additional data.
Data modules
editString modules
editString modules are used to store type data for use with several road templates, including {{jct}} and {{routelist row}}.
Banner modules
editBanner modules store data about banners that should be shown. For example, Module:Road data/banners/USA defines the "TO" banner shown when {{jct}} is used with a |to= parameter in the United States i.e. 
To I-82.
Mask modules
editMask modules store masks that can be hooked into by #String modules. See Module:Road data/strings#Hooks and Module:Road data/parser/hooks#mask.