Bhutan is a mountainous country and its general road conditions are not very good. Roads connecting urban areas are well maintained but roads connecting rural areas are quite poor. Traffic is not a problem in Bhutan but emergency services on road or road assistance are rare and public transportation in Bhutan is not considered safe. However, it is compulsory to arrange trips through registered tour operators in Bhutan and payment has to be made before you enter the country as a tourist, so tourists will mostly travel in large groups and will not get to drive around much. They will not have to use Bhutanese public transportation too and will have experienced drivers to help them commute from one place to another.
Transportation is included in the itinerary they paid for before entering Bhutan. Bhutan has high mountains, steep slopes and deep valleys. It has a fairly well developed network of roads but it is not very extensive. The roads that connect major tourist sites are reasonably well maintained and paved. They generally have either single lane or two lanes. Driving on Bhutanese roads can be tiring and slow for some of the tourists as there are sharp curves and bends, narrow lanes and limited visibility that can be quite hazardous, hence the emphasis on hiring experienced drivers
There are as many as 6 or 7 bends in a kilometer and steep ascents and descents are major characteristics of the roads in Bhutan. It is recommended to drive on reduced speed, which on an average is never more than 30 km/hr, and to observe special caution. Except the Gasa district, all major towns in the 20 districts of Bhutan are accessible by road. Tourist buses are even slower for commuting purposes. However, you can enjoy spectacular views of towering mountains, glorious monasteries, ancient villages with their old-world feel intact and lush green forests. Roads can be bumpy and density of traffic is normally very low.
