Abstract: In Nigerian, most roads are in bad shapes leading to negative economic effects. One of the factors affecting vehicle maintenance is bad road network in Nigeria. The economic effects of bad road networks in Nigeria are studied. The estimated current total road network in Nigeria is about 194,000 kilometers. The analysis showed that about 19% of Nigerian roads are paved. All unpaved roads which is about 13% are bad roads. Both the paved and the unpaved roads in Nigeria are deteriorating by the day and has become a source of worry to all vehicle users. Annual losses (from vehicle maintenance), due to bad roads is valued at over N133.8billion. This is outside all other economic losses from bad roads in the areas of air Pollution, delayed movements, armed robbery and incessant accidents on the roads. Out of a total of 703 respondents, over 51 % had their cars damaged in a month due to bad roads in their areas. By extension, about 51% of vehicle users in Nigeria will experience one or more damages to the vehicles in a month. This should be of great concern to any serious government.