From Longman Dictionary of Contemporary EnglishSunday driverSunday driverTTCINSULTan insulting expression meaning someone who annoys other people by driving too slowly → Sunday
Examples from the Corpus
Sunday driver• Too many Sunday drivers for my liking.• He has the settled attitude of the Sunday driver.Sunday driverˌSunday ˈdriver noun an insulting word for someone who annoys other drivers by driving very slowly and carefully, as if he or she only drives on Sundays on pleasure trips Sorry I’m late – I got stuck behind a Sunday driver! 