Assessment of vehicle trip production rates in Ilorin (Nigeria)

  • Y.A Jimoh


Urban transportation planning involves four sequential stages of trip production, distribution, modal split and assignment. Inaccurate quantification of trip production affects the other stages, leading to ineffective manage-ment of traffic (motorized and non-motorized) and breakdown of mobility within the city. Assessment of trip rates for estimation of traffic flow in Ilorin was undertaken. The city was divided into 5 zones, and origin and destination traffic survey questionnaires were administered to 110 households in each zone, to obtain primary data on socio-economic characteristics of daily trip patterns and preferred modes of travel. The data was analyz-ed for trip production rates by regression and cross classification models. Occupation, age, gender, income lev-el, vehicle ownership, trip length and fare structure affected the total trip generation, with an average production rate of 3.5, in the range of 2.79 - 4.29. The lower rate was characteristic of school children (5 - 15 years), while the highest rate was attributed to affluent and elderly persons owing cars. Motorized traffic generated 85 % of the trips, while inter-zonal movements from high density residential zones to schools and/or markets were the dominant traffic patterns.

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