Route permits are required to travel around Bhutan, and there are check posts in most districts east and north of Thimphu where you are required to produce these documents in order to proceed. Route permits are processed by your local tour operator on applying for your visa. These permits are issued by the immigration office in Thimphu (Northern end of Norzin Lam).
The roads that cross the country are characterized by their twists, turns, and steep inclines, but despite the difficult topography, they are generally very well-maintained and safe. Local and inter-district bus services are not very comfortable and stop frequently. Your local tour operator will provide a vehicle and driver for the duration of your stay. This cost is included in the daily tariff. However, traveling by local or inter-district bus or taxi can also be organized. It is recommended that you drive in Bhutan only if you have experience driving in mountainous regions. The quality of road surface is variable with endless mountainous hairpin bends. It is recommended that you pack travel sickness tablets.
As the public transport running between towns in Bhutan is infrequent, hitching is a very common way to get around. The thumb in the air symbol, however, is not recognized, and you will need to flag down a passing vehicle in order to get one to stop. NB: As some drivers pick up passengers as a means of supplementing their incomes, it is customary to offer payment when getting out of the vehicle (the amount depends roughly on the distance, but it will be comparable to the cost of traveling by bus). However, most drivers require nothing, and are more than happy just to have some company and the opportunity to make a new friend. If you plan to hitch a lot (and in some rural areas there is no other way to get around), it is a good idea to take a few small gifts to offer the drivers as an expression of your appreciation. It is generally very safe to hitchhike throughout the country, especially outside of the most urban areas, like Thimphu.
Due to the mountainous terrain, roads are frequently blocked by rock falls during the summer season. Therefore, it is best to avoid traveling long distances from the beginning of June to the end of August. However, if you must travel at this time, carry ample bottled water and snacks as if the landslide occurs it could take some time to clear the road.
At an altitude of 3750 meters, the section of road that runs through the Thrumshingla Pass connecting Bumthang and Mongar is the highest in the country and offers some spectacular scenery. However, due to the steep sides of the valley it is especially susceptible to rock falls, so be prepared for long waits during the wet periods in particular.