Current research and practices on guide signs studies mainly focus on how to set up a particular guide sign. Less attention is on the tolerable or optimal number of advance guide signs on a sign structure. This paper will assess drivers' workload on various freeway guide sign structures and sign information units, and propose the desirable number of guide sign panels and symbol signs on one freeway guide sign structure. A posterior questionnaire survey was conducted after drivers finished the driving simulator test. Drivers' perception and cognition on different sign structures are carefully analyzed using the NASA-Task Load Index. With the statistical analyses of questionnaires and the recorded data from driving simulator tests, the optimal advance placements of guide signs considering drivers' workload are proposed. Recommendations are provided on how to better deliver necessary information to motorists under various geometric and traffic conditions.


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    Title :

    Using NASA-Task Load Index to Assess Drivers' Workload on Freeway Guide Sign Structures


    Contributors:
    Qiao, Fengxiang (author) / Zhang, Rong (author) / Yu, Lei (author)

    Conference:

    11th International Conference of Chinese Transportation Professionals (ICCTP) ; 2011 ; Nanjing, China


    Published in:

    ICCTP 2011 ; 4342-4353


    Publication date :

    2011-07-26




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English




    NASA Task Load Index (TLX)

    Hart, Sandra G. | NTRS | 1986


    NASA Task Load Index : deutsche Version

    Sepehr, M. / Institut für Fahrzeugtechnik, Technische Universität Berlin | TIBKAT | 1988




    The Effect of Previous Level of Workload on the NASA Task Load Index (TLX) in a Simulated Flight Task

    Moroney, B. F. / Reising, J. / Biers, D. W. et al. | British Library Conference Proceedings | 1994