The impact of arc visibility on curve negotiation

Article English OPEN
Jamson, SL ; Benetou, D ; Tate, F (2015)
  • Publisher: Aracne

A high percentage of serious accidents occur on sharp horizontal curves, especially on two-lane rural roads. A growing body of literature has examined driving behaviour on horizontal curves, with most research relating the effect of curve radius on driver’s speed and steering behaviour. There is an agreement that increasing degrees of road curvature result in less safe curve negotiation performance and consequently more accidents. Few studies, however, have further explored the effect of limited visibility on curve negotiation. This paper reports the results of a driving simulator study aimed at examining drivers’ behaviour on horizontal curves, in terms of speed and lateral position, in relation to varying levels of visibility of the curve’s arc. A two-lane rural road was designed and implemented in a desktop driving simulator and ten curve scenarios were examined with five different levels of visibility (20%, 40%, 60%, 80% and 100%), and of two curve radii (150m and 250m). Thirty drivers participated in the experiment; statistical analysis showed there to be a clear effect of radius on driver speed, as would be expected. However, when visibility decreased, reductions in driver speed were only found at the lowest level (20% preview). This speed reduction, however, was not sufficient enough for drivers to be able to negotiate the curve without detriment to their lateral positioning. Drivers tended to decelerate later and more sharply in the poor visibility curve and then have to compensate by moving towards the centre-line in order to flatten out the curve. It is concluded that whilst drivers can adapt sufficiently on curves that have moderate pre-view, when visibility deteriorates below a threshold (in this case 20% preview) drivers are unable (or willing) to reduce their speed appropriately and thus risk lane excursion.
  • References (42)
    42 references, page 1 of 5

    1. Agent, K.R. (1980). Transverse pavement markings for speed control and accident reduction. Transportation Research Record, 773 (1980), pp. 11-14.

    2. Bella, F. (2009). Can the driving simulators contribute to solving the critical issues in geometric design? Transportation Research Record No. 2138. TRB of the National Academies, Washington, D.C., 120-126.

    3. Bella, F. (2011). How traffic conditions affect driver behavior in passing maneuver. Advances in Transportation Studies RSS2011 Special Issue, pp 113-126.

    4. Bella, F. (2013). Driver perception of roadside configuration on two-lane rural roads: Effects on speed and lateral placement. Accident Analysis and Prevention 50 (2013), pp. 251-262.

    5. Blaauw, G.J. (1982). Driving experience and task demands in simulator and instrumented car: a validation study. Human Factors 24(4), pp 473-486.

    6. Bonneson, J.A., Pratt, M. Miles, J. and Carlson P. (2007). Development of Guidelines for Establishing Effective Curve Advisory Speeds. FHWA/TX-07/0-5439-1. Texas Department of Transportation, Austin, Texas.

    7. Calvi A (2015). A Study on Driving Performance Along Horizontal Curves of Rural Roads. Journal of Transportation Safety & Security, Vol. 7(3), p. 243-267.

    8. Cenek, P. D. et al. (2011). A prioritisation scheme for the safety management of curves. Proceedings of 3rd International Surface Friction Conference, Safer Road Surfaces - Saving Lives, Gold Coast, Australia 2011.

    9. Charlton, S. G. and de Pont, J. J. (2007). Curve speed management. Land Transport New Zealand: Research Report 323.

    10. Chen, S. H. (2010). Mining patterns and factors contributing to crash severity on road curves. PhD thesis, Queensland University of Technology.

  • Metrics
    0
    views in OpenAIRE
    0
    views in local repository
    293
    downloads in local repository

    The information is available from the following content providers:

    From Number Of Views Number Of Downloads
    White Rose Research Online - IRUS-UK 0 293
Share - Bookmark