BENGALURU: A symbiotic relationship exists between motorists and villagers along the Bengaluru-Mysuru Road, but this is now under threat with the 10-lane highway coming up between the two cities, warned JDS MLA DC Thammanna. A former engineer, Thammanna has shot off a letter to Chief Minister Basavaraj Bommai saying that the 139-km stretch of the lane serves as a lifeline for around 200 villages and many towns.