Some states have laws against riding a bicycle on a street or highway while under the influence of drugs or alcohol (cycling under the influence, or CUI). Other states apply traditional DUI/DWI laws to cycling while under the influence of drugs or alcohol. And some states don't have a specific CUI law, and don't apply traditional DUI/DWI laws to riding a non-motorized vehicle, such as a bicycle.
In Indiana, the laws that apply to driving under the influence of alcohol or drugs (DUI) do not explicitly include bicycles. Indiana's DUI laws apply to 'vehicles,' and under Indiana Code, a vehicle is defined as a device for transportation by land or air, which could be interpreted to include bicycles. However, Indiana law specifically defines a 'motor vehicle' for the purposes of DUI enforcement, and this definition does not include bicycles. Therefore, while there is no specific cycling under the influence (CUI) law in Indiana, cyclists could potentially be charged under public intoxication laws if they are riding a bicycle while under the influence and are endangering themselves or others, or are breaching the peace. It is important to note that local ordinances may have additional regulations regarding cycling and alcohol consumption, so cyclists should be aware of the laws in their specific locality.