Impaired driving due to alcohol or drugs: International differences and determinants based on E-Survey of Road Users' Attitudes first-wave results in 32 countries

•Self-reported driving over the legal limit varies from 11% in the EU to 17% in Asia/Oceania.•Drivers reporting multiple offences vary from 2% (EU) to 7% (Asia/Oceania).•Six countries identified increased odds of self-reported drinking and driving and of drivers engaging in drugged driving.•Multiple offenders have the greatest odds of being involved in (self-reported) injury crashes.•Impaired driving and multiple offences are linked to various violation-related beliefs.