A unique feature of large South Asian cities is the composition of their urban street traffic. Because many different traffic entities of varying size continuously interact on the street, the traffic mixture is heterogeneous. Heterogeneous traffic increases street capacity. Homogeneous traffic prevails in most North American, European, and Australian cities. Two broad categories comprise heterogeneous traffic: namely, motorized vehicles and nonmotorized entities. After collecting geometric, composition, speed, and conflict data at 14 midblock sites, heterogeneous traffic was examined at a microscopic level. The best model shows that the high-fatality midblock sites correlate to unidirectional street widths at a +0.89 correlation coefficient. The degree of heterogeneity and motorized traffic flow has the strongest relationship with street width at a +0.99 correlation coefficient. Given constant motor vehicle flow, the analyses revealed that when the traffic heterogeneity index approached 1 (i.e., 50% motorized and 50% nonmotorized), fewer midblock fatalities occurred.


  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 55-60
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00781576
  • Record Type: Publication
  • ISBN: 0309071186
  • Files: TRIS, TRB, ATRI
  • Created Date: Feb 1 2000 12:00AM