Performance Analysis of Urban Road Intersections and its Environmental Implication: A Case Study of the Lagos Metropolitan Area

This paper describes how urban road intersections are a major factor that influences the effectiveness of traffic flow systems. This paper is aimed at examining the performance of road intersections in the Lagos metropolitan area using the “Y-junction” of Oga- Ikorodu (Lagos, Nigeria) as the case study. The paper examines the delay factors, time wasted and traffic conflicts. The study uses a reconnaissance survey, delay analytical tool, vehicle spot speed study and traffic volume survey to assess the level of delay, economic loss and traffic flow interruption. The study reveals that there are varying Levels of Service (LOS) obtainable at different times of the day on different carriageways. The percentage of vehicle stoppage falls between 41.1%–87.8% indicating that vehicles tend to experience a stop scenario at each approach especially during the peaks. It is therefore pertinent to note that the road intersection operates at a very low LOS especially during the evening peak when controlled by traffic wardens. It is therefore recommended that a Diamond-at-grade intersection be constructed in the area instead of the roundabout. The introduction of an automated traffic control system with full control of access and total removal of on-street parking will remove the road users’ burden in the area.


  • English

Media Info

  • Media Type: Print
  • Features: Figures; Photos; References; Tables;
  • Pagination: pp 167-178
  • Monograph Title: Urban Transport XVII. Urban Transport and the Environment in the 21st Century

Subject/Index Terms

Filing Info

  • Accession Number: 01354049
  • Record Type: Publication
  • ISBN: 9781845645205
  • Files: TRIS
  • Created Date: Oct 4 2011 11:12AM