Transit Network Design Problem (TNDP) is the most
important component in Transit planning and operation, in
which the overall cost of the public transportation system
highly depends on it. The main purpose of this study is to
develop a simple and effective solution methodology for the
TNDP, which goes beyond previous traditional sophisticated
approaches. The solution methodology adopted in this
research for the TNDP is based on partitioning the solution
into two consecutive stages; Transit route Network Design
Problem “TrNDP” stage and frequency setting stage. In the
first stage; a deterministic solution for TrNDP is tackled to
construct bus routes. The deterministic manner of the TrNDP
solution relies on using linear and integer mathematical
formulations that can be solved exactly with their standard
solvers. In the second stage; bus frequencies are optimized
among bus routes (obtained in stage 1) via Genetic Algorithm,
for a total bus fleet size representing operator's main cost. The
adopted solution methodology has been tested through
Mandl’s benchmark transit network problem. The test results
showed that the methodology developed in this research is
able to provide and effective solution in terms of the number
of constructed routes, the direct demand coverage, and the
total travel time