The existing, two-lane roads between major cities are quite narrow at places, lack guardrails, and are full of curves. Travel by road should be considered risky, as roads are not well maintained, particularly in winter. Driving in winter is hazardous due to fog, heavy snow, and ice. The driving habits of local drivers are poor, and many vehicles are in bad condition. Many accidents occur when drivers exceed safe speeds along winding mountain roads.
Accidents involving drunk driving are an increasing problem.
Driving after dark is especially dangerous. Except for Sarajevo, street lighting is not widespread, road construction may be poorly marked, and heavy vehicles move slowly on hills. Travelers are encouraged to convoy with other vehicles, if possible, and to plan their trip to ensure they travel only during daylight hours. Although the number of service stations outside major cities has increased in recent years, many do not offer mechanical or other services. Speed limit traffic signs are not always obvious or clear.