A lack of methodological tools that can be used to support decision makers in decreasing greenhouse gas emission levels has motivated us to write this paper. This paper investigates the problem of determining the allocation of available green route capacity. The approach for designing a green transit network that offers green vehicles shorter travel times between given origins and destinations is discussed. This approach is extended to minimize greenhouse gas emissions. For this purpose, bi-level programs are formulated to minimize the emission function under competitive and non-competitive scenarios.