The broader transmission of HIV beyond these HRGs often occurs through those who also have lower risk sexual partners in the ‘general’ population. For example, a worker might also have a wife or other partner who is at risk of acquiring HIV from partner. Individuals who have sexual partners in the highest risk groups and other partners are called a ‘bridge population’, because they form a transmission bridge from the HRG to the general population. Truckers and Migrants are called ‘bridge population’.