<Table> <Tr> <Td> </Td> <Td> This article may be too technical for most readers to understand . Please help improve it to make it understandable to non-experts, without removing the technical details . The talk page may contain suggestions . (February 2017) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article may be too technical for most readers to understand . Please help improve it to make it understandable to non-experts, without removing the technical details . The talk page may contain suggestions . (February 2017) (Learn how and when to remove this template message) </Td> </Tr> <P> "Drunk driving" is the act of operating or driving a motor vehicle while under the influence of alcohol or drugs to the degree that mental and motor skills are "impaired". It is illegal in all jurisdictions within the United States, though enforcement varies widely between and within states / territories, to drive a motor vehicle while impaired or with a breath or blood alcohol concentration of 0.08% or greater if over the age of 21 . </P> <P> The specific criminal offense is usually called driving under the influence (DUI), and in some states' driving while intoxicated' (DWI),' operating while impaired' (OWI), or' operating a vehicle under the influence' (OVI). Such laws may also apply to boating or piloting aircraft . Vehicles can include farm machinery and horse - drawn carriages . </P>

What is the blood alcohol limit in usa