Involving the environmental dimension in traffic control methods is the recent trend
in transportation research. This paper introduces an eco-routing method that searches
for route optima to target the social optimality but considering the user preference as
well. A negotiate trade-off between four travel-costs is considered for the route
optimality. The four travel costs are the vehicular emission cost, the user instinctive,
traffic performance, and the user preference. Fuzzy multi-objective decision
optimization is utilized for the decision model to select the optimal route from the
fuzzy set of available alternatives between the origin and the destination. The
introduced method outperforms the literature eco-routing methods that
overemphasizes the most weighted criteria and neglects the decrease of marginal
utility or consider the environmental dimension only as a constrain for the travel time
minimization problem