1. GODTHELP , J. , and RIEMERSMA , J. B. J. (; 1978 ), Work zones on undivided roads; the effect of illumination when approaching the work area . Institute for Perception TNO Report 1978-C24 , Soesterberg , The Netherlands .
2. GODTHELP , J. , and RIEMERSMA , J. B. J. , 1982 , Perception of delineation devices in road-work zones during night-time . Society of Automotive Engineers, SAE paper 820413 .
3. MCGEE , H. W. , PAIN , R. F. , and KNAPP , B. G. , 1979 , Evaluation of traffic controls for highway work zones . Vols. I and II. Report No. 17–4, Bio-Technology Inc., Falls Church , Virginia , U.S.A .