The road network throughout Vietnam is reasonable but the standard of the roads varies dramatically from good to appalling. Roads throughout Vietnam are designated by numbers and the main north to south route is Highway 1 connecting Hanoi with Ho Chi Minh City. In theory, traffic drives on the right but in practice drivers take the most direct path avoiding the many thousands of bicycles, motorbikes and animals wandering along the road. As self-driven car hire for visitors is non-existent, visitors to the country have to hire a car with a driver. Most will agree that this is the only way until the country introduces and enforces a system of road rules.
There are basic rules, such as you must stop at a red light and headlights must be used at night, but that tends to be as far as it goes. Long-term foreign residents are allowed to drive a car but few are brave enough to do so, preferring to employ a Vietnamese driver. It is safe to assume that if a foreigner is driving a car involved in an accident, he or she will automatically be at fault.