Maycock, G. Accidents at 4-arm roundabouts / by ... and R. D. Hall - Crowthorne, Berkshire : Transport and Road Research Laboratory, 1984 - 60 p. - Transport and Road Research Laboratory. TRRL Laboratory report ; no. 1120 . Subjects--Topical Terms: Traffic accidents--Research LC Class. No.: TE7 R63 no. 1120