Dennis 'Joe' Lyons (26 August 1916 – 29 March 2011) was a British scientist who researched topics ranging from rockets to #roundabouts. He led the research of the #BlueStreak and #BlackKnight rockets that were developed at the #RoyalAircraftEstablishment during the 1950s. In 1965 he became the director of the #RoadResearchLaboratory, overseeing the introduction of the #breathalyser, motorway #crashBarriers and compulsory front #seatBelts.