Ergonomics 42(12), 1646}1664. Motion sickness in public road transport: the e!ect of driver, route and vehicle. (19 pages, 12 "gures, 4 tables, 22 references) (in English) Authors1 Abstract. Relationships between vehicle motion and passenger sickness have been investigated in a survey of 3256 passengers travelling on 56 mainland U.K. bus or coach journeys. Vehicle motion was measured throughout all journeys, yielding over 110 h of six-axis coach motion data from "ve types of coach and 17 di!erent drivers. Overall, 28)4% of passengers reported feelings of illness, 12)8% reported nausea and 1)7% reported vomiting during coach travel. Passenger nausea and illness ratings increased with increased exposure to lateral coach motion at low frequencies ( (0)5 Hz). Motion in other axes correlated less well with sickness, although there were some intercorrelations between the motions in the di!erent axes. Sickness level among passengers were greater with drivers who drove to produce higher average magnitudes of fore-and-aft and lateral vehicle motion. Nausea occurrence was greater on routes classi"ed as being predominantly cross-country were magnitudes of lateral vehicle motion were signi"cantly higher. Lateral motion and motion sickness increased from the front to the rear of each vehicle. No signi"cant di!erences in sickness were found between the "ve di!erent vehicle types used in the study. The applicability of a motion sickness dose model to those data is discussed. ΒΉopics: Motion sickness (causes of, prevention); Vibration measurements (road vehicles).