title: Additional road markings as an indication of speed limits: results of a field experiment and a driving simulator study.
abstract: Although speed limits are indicated by road signs, road users are not always aware, while driving, of the actual speed limit on a given road segment. The Roads and Traffic Agency developed additional road markings in order to support driver decisions on speed on 70 km/h roads in Flanders-Belgium. In this paper the results are presented of two evaluation studies, both a field study and a simulator study, on the effects of the additional road markings on speed behaviour. The results of the field study showed no substantial effect of the markings on speed behaviour. Neither did the simulator study, with slightly different stimuli. Nevertheless an effect on lateral position was noticed in the simulator study, showing at least some effect of the markings. The role of conspicuity of design elements and expectations towards traffic environments is discussed. Both studies illustrate well some strengths and weaknesses of observational field studies compared to experimental simulator studies.
authors.affiliation: Transportation Research Institute, Hasselt University, Wetenschapspark 5 Bus 6, Diepenbeek, Belgium. stijn.daniels@uhasselt.be
authors.forename: Stijn
authors.initials: S
authors.lastname: Daniels
authors.forename: Jan
authors.initials: J
authors.lastname: Vanrie
authors.forename: An
authors.initials: A
authors.lastname: Dreesen
authors.forename: Tom
authors.initials: T
authors.lastname: Brijs
mesh_terms: D000054:Acceleration; D000328:Adult; D000368:Aged; D000704:Analysis of Variance; D001336:Automobiles / Q000331:legislation & jurisprudence / Q000592:standards* / Q000706:statistics & numerical data; D001530:Belgium; D003071:Cognition; D003198:Computer Simulation / Q000592:standards* / Q000706:statistics & numerical data; D005260:Female; D033161:Government Regulation; D006801:Humans; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D011581:Psychological Tests; D012309:Risk-Taking; D012449:Safety / Q000331:legislation & jurisprudence / Q000592:standards* / Q000706:statistics & numerical data; D012984:Software; D011795:Surveys and Questionnaires; D013647:Task Performance and Analysis; D055815:Young Adult